Your knife, your board, and mise en place

Cut a carrot badly and put it in a hot pan. Some pieces are thin coins and some are thick chunks. Five minutes later the coins are brown at the edges and the chunks are still crunchy in the middle, and there's no heat setting that fixes it. You can take the pan off and eat half-raw chunks, or leave it on and eat scorched coins. The mistake was made on the board, before the pan was hot.

That is the first thing this course wants you to see. A knife is not only a way of making food smaller. The size you cut sets how long a piece takes to cook, so the board is where cooking starts. This lesson teaches how to hold a knife and guide it safely, the sizes cooks use and what their names mean, why a sharp edge is easier to control and how to keep one, which board to use, and how to set up your work before the heat goes on.

What this course is, and what it assumes

Cooking Fundamentals teaches the handful of things most cooking is built from: knife work, how heat moves into food, seasoning by taste, the food-safety rules that matter, and the main ways of cooking with dry heat and with water, then eggs, grains and beans, stocks and sauces, and one loaf of bread. It is organised by method rather than by recipe, because a method travels to the next dish and a recipe does not.

What you will need. One chef's knife, a cutting board, a heavy frying pan, a pot with a lid, a sheet pan (a flat, rimmed baking tray) and an instant-read thermometer. A kitchen scale helps in lessons 3, 11 and 12, and lessons 7 and 11 need an oven. The thermometer may be the surprise on that list. The US Food Safety and Inspection Service (FSIS) says only about 15% of people consistently use one,¹³ and lesson 2 shows why a thermometer tells you things a recipe's time cannot. Every practice that uses meat also has a meat-free version that exercises the same idea.

What it leaves out. It makes no claims about what's healthy to eat; Nutrition: The Evidence, earlier in this term, covers that, and this course points back to it when salt or browned meat comes up. It doesn't teach pastry or cakes, deep frying beyond its fire safety, butchery beyond a chicken, home canning, special or religious diets, or managing food allergies. It does not treat injuries either. If you cut yourself, First Aid and CPR, later in this term, is the course that teaches what to do, and this lesson deliberately doesn't try. Nothing here says what anything costs.

This course is education, not advice for your own kitchen or your own health. Where the rules differ between countries, and for food safety they often do, it gives the US and UK rules side by side and tells you to follow your own country's regulator.

The course's question. Every kitchen rule is a mechanism squeezed into an instruction, and rules fail when they are carried somewhere the mechanism does not reach. So this course asks one question of every rule it meets: what is this rule protecting, and does it apply here? You'll use it for the first time before this lesson is out.

Holding the knife

Most beginners hold a chef's knife by the handle, like a hammer. It feels secure, and America's Test Kitchen's knife guide (ATK from here on) grants that, but says the handle grip "doesn't offer the control over the tip that is needed to make precision cuts."¹

What ATK teaches instead is the pinch grip: "Pinch the blade where it meets the handle with your thumb and forefinger. This grip, our go-to for most cutting tasks, allows you to choke up on the blade to get leverage over the whole length of the knife."¹ Your other three fingers wrap the handle. It feels odd for a day or two, because your thumb and finger are on the steel, but it puts your hand closer to the edge's work, and that is where the control comes from.

Your other hand matters more for safety. ATK calls its position the claw: "Curve your fingers into a claw on top of the food, making sure to tuck your thumb behind them and pressing down to hold the food in place. This position allows your knuckles to help guide the side of the blade while your fingertips stay out of harm's way."¹ The flat of the blade rests lightly against your knuckles, your fingertips are curled back behind them, and after each cut the claw walks back a step. The size of that step is the size of your slice. ATK notes that with practice the claw moves back in even steps, which is what guides the knife to even slices.¹

Most cuts are not a straight chop downward. ATK's guide describes a rocking motion for small items, tip on the board, pushing down and forward, and for large items lifting the whole blade to start each cut.¹ Either way the blade moves forward or back as it goes down, which is what lets it slice rather than crush.

A board that doesn't move

A knife slipping is one danger. The board slipping is another, and it's easier to fix. The University of Kentucky's knife-skills handout says that if your board moves around, put a damp towel or paper towel under it, or buy an anti-slip mat.³ Its grip and claw advice repeats ATK's almost word for word, so it isn't an independent second opinion, but it is the source this course has for the towel.

The food has to be stable too. A round thing on a flat board rolls, and a rolling onion under a moving blade is how people get cut. ATK's rule: "Create flat, stable surface by cutting food in half or removing thin slice from bottom. Hold food with claw grip."¹ Every round vegetable starts this way, and you will see it twice in the examples below.

An onion, cut by cut

This is ATK's written method, for taking a whole onion to a medium dice, with the reason for each cut.²

1. Halve it through the root. Cut from the top down through the root end, "pole to pole". Then peel it and trim the top. The skin comes off more easily once the onion is cut.² The halving also gives you the flat side.
2. Lay it flat side down. Now it can't roll.
3. Leave the root on. ATK says many chefs cut off both ends first, "However, for the average home cook, we find that leaving the root intact makes it easier to keep the layers together as you make each cut."² The root is the hinge that holds everything while you work.
4. Make a few horizontal cuts from the top end towards the root, keeping your guiding hand flat on top of the onion, and stop before the root.
5. Make several vertical cuts, again up to but not through the root.²
6. Turn it so the root is at the back, and slice across the earlier cuts, with your claw guiding the blade. The dice falls away as you go, and you stop at the root and throw it out.

The spacing of your cuts decides the size. For chopped or diced onion, ATK leaves a quarter to half an inch between cuts, about 6 to 13 mm; for minced, an eighth to a quarter of an inch, about 3 to 6 mm.² (The millimetres here and throughout are this course's conversions.) ATK gives the reason the size matters in one line: "The goal when chopping an onion is to obtain evenly sized pieces that will cook at an even rate."²

Why size is a cooking decision

ATK's general knife guide gives the aim of all cutting as avoiding crushed food and creating "even-size pieces that cook at the same rate and/or ensure even flavor distribution throughout the dish."¹ The first half of that is the one that changes what happens in the pan, and the reason is how heat gets into food.

Heat arrives at the surface of a piece and has to travel inward, and the centre is the last part to get hot. A thicker piece does not just have more distance to cover. Douglas Baldwin, writing about cooking meat in a water bath, puts the relationship plainly: "a steak that is twice as thick takes about four times longer to cook and cool!"⁶ Lesson 2 explains why it works that way. For now, the consequence is what matters. Carrying Baldwin's rule from meat to a carrot is this course's inference from the same physics, not a measurement of carrots, but it predicts what the pan of badly cut carrots showed: double the thickness and you do not get twice the time, you get something nearer four times.

A carrot, and the rule's first test

A carrot is the harder case, because it's round, it tapers, and it rolls. The first job isn't a cut for size at all. It is making a flat side, by halving the carrot along its length or taking a thin slice off one side, and laying it on that face.¹ Only then does the claw have something steady to hold.

The taper causes the second problem. Chop a whole carrot into chunks straight across and a chunk from the thick end can be three or four times as wide as one from the tip, so the same chopping gives you big pieces and small ones. This course's fix is to cut the thick end in half or quarters lengthways first, so the pieces you cut across it come out about the size of the ones from the thin end. Ginger and sweet potato are the same problem at different sizes: flat side first, then size the pieces to match.

Now ask the course's question of "cut evenly." What is it protecting? Pieces that go into the heat together finishing together. Does it apply here? For a single vegetable in a single pan, yes, and that is the carrot. But when a firm vegetable and a soft one go into the same pan at the same time, the rule's purpose points somewhere its wording doesn't. Even time, not even size, is what it protects, so the firmer vegetable gets cut smaller. That's this course's inference from the mechanism, not a rule any source states, and your own pan is the test of it. The other solution, of course, is to put the firmer vegetable in first.

The names for sizes

Kitchens use a set of names for standard cuts. They come from French classical cooking, and they're one tradition's vocabulary for sizes, which is how to treat them. Other cuisines have their own shapes and their own words, and nothing in this course calls one tradition's cuts the proper ones. What the names give you is a shared language for "how big", and a way to read a recipe precisely.

Here are the sizes the Escoffier School of Culinary Arts gives, in its inches, with this course's metric conversions.⁴

Look at the pairs. A brunoise is a julienne cut across into cubes, and a small dice is a batonnet cut across. That suggests the order of work: slice to a thickness, cut the slices into sticks, and cut the sticks into cubes. The exact millimetre matters less than your pieces matching each other.

Home recipes mostly use different words for the same idea. ATK's own recipe vocabulary runs: "Minced" means 1/8-inch pieces or smaller, "Chopped fine" 1/8 to 1/4 inch, "Chopped medium" 1/4 to 1/2 inch and "Chopped coarse" 1/2 to 3/4 inch.² So when an ATK recipe says "chopped medium", it's asking for roughly Escoffier's small to medium dice, about 6 to 13 mm. Other publishers may use these words differently, and a recipe that does not define them leaves you to judge.

Which size does a dish want? Follow the same logic as the carrots. The size should match the time the piece will spend in the heat. A long braise can take large pieces that would never cook through in a quick sauté, and a sauce cooked for ten minutes needs its onion small enough to soften in ten minutes.

Sharp, and staying sharp

The standard advice is that a sharp knife is safer than a dull one. OSHA, the US workplace safety regulator, puts it in its guidance for young restaurant workers: "Keep knives sharpened and in good condition; dull knives tend to slip and may cause injuries."⁷ ATK gives the mechanism: "a dull blade requires more force to do the job and has a higher chance of slipping and missing the mark."¹ A dull edge skids on a tomato skin or an onion's outer layer instead of biting, you push harder, and when it finally goes, it goes with more force behind it. ATK adds that the usual result of a dull knife is crushed or bruised food, not a cut, which is a second reason to keep an edge.

How good is the evidence? Better than folklore, but not what the confident version implies. What has been measured is force. In 2003, researchers at the Liberty Mutual Research Center for Safety and Health measured 15 professional meat cutters in two plants. Sharpness affected their grip force, the turning effort at the wrist (the paper's "cutting moments") and cutting time, "with sharper blades requiring statistically significantly lower peak and mean cutting moments, and grip forces than dull knives".⁹ Those cutters were already gripping hard: their mean grip force was 28.3% of their maximum, and their peak 72.6%.⁹ That is the evidence for "a dull knife takes more force." The next step, from more force to more cuts, is the mechanism OSHA and ATK both state. This course found no study that counted injuries with sharp and dull knives. So treat "a sharp knife is safer" as professional consensus with a measured mechanism behind it, not a counted result. That is still a good reason to keep your knife sharp.

What is counted is how many people get cut. Gary Smith's study of US emergency departments from 1990 to 2008 estimated an average of 434,259 knife injuries a year, about 1,190 a day.⁸ Fingers or thumbs were injured in 66% of cases.⁸ Among the injuries where the type of knife was recorded, kitchen knives accounted for 36%, behind pocket and utility knives at 47%, but the type was recorded for only about 2.5 million of the 8.25 million injuries, so 36% is a share of that subset, not of all knife injuries.⁸ Those figures are old, and they are about all knife injuries, not only cooking. What they tell you is that fingers and thumbs are where it happens, which is exactly what the claw protects.

Honing and sharpening are different jobs

The rod sold with most knife sets is usually called a sharpening steel. ATK calls that name a misnomer,¹ and explains why. As you cut, "the force of repeated cutting bends microscopic pieces of the blade to either side, making it harder to push the blade through the food, which in turn makes it feel dull to the user."¹⁰ The edge is still there; it has just been knocked out of line.

A steel fixes that. In ATK's words, honing "repositions (or “trues”) the edge of a blade that is slightly out of alignment to restore sharpness. Sharpening trims and reshapes the blade by removing metal that is blunted or too far out of alignment for honing to work."¹ So a steel straightens and a sharpener or a stone grinds. ATK's companion page adds that honing takes about a minute against five to sharpen, and "doesn’t remove much metal from the blade".¹⁰ Note "much": the claim is little, not none.

How to hone, from ATK's guide.¹ Hold the knife by the handle. Stand the steel upright with its tip on the counter. Put the heel of the blade against the top of the steel, tip of the knife pointing slightly up, at a steady angle of about 15 to 20 degrees depending on the knife. Sweep the blade down and towards you so the whole edge touches the steel, then do the other side. Four or five strokes a side is enough. The pressure should be light: ATK says, "Despite what many cooks believe, proper honing requires very little pressure."¹⁰ Doing it this way, with the steel planted and the blade moving down and towards you, keeps the edge travelling away from both hands.

How do you know which one a knife needs? ATK's paper test.¹¹⁰ Hold a sheet of copy paper by one end and draw the knife through it from heel to tip. If it snags, hone it and try again. If it still fails, it needs sharpening. ATK's rule of thumb is to hone every time you start to cook, and to test weekly if you cook often.¹ If your knife came without a steel, the paper test still tells you whether it needs sharpening, and ATK's advice when honing fails is to "run it through a sharpener."¹ This course doesn't teach sharpening; follow the instructions that come with your sharpener or stone.

The rules about knives, and what each protects

OSHA's knife guidance is written for teenagers working in restaurants, but most of it transfers straight to a home kitchen.⁷ Here are the rules in its own words. OSHA states them without reasons, so the reason after each one is this course's reading of what it protects.

• "Let a falling knife fall. Do not try to catch it." A falling knife can turn as it drops, and you cannot see which way the edge is facing. Your reflex is to grab, which is why the rule has to be learned. Step back instead.
• "Do not store knives and other sharp objects in sinks between periods of use." A knife under soapy water is invisible, and the next hand into the sink finds it by touch.
• "When interrupted, stop cutting and place the knife down on a secure surface." Your eyes go to whoever interrupted you, and the claw stops being a claw.
• "Carry knives with the cutting edge angled slightly away from your body, with the tip pointed down to your side." And don't hand a knife over: "Place a knife that you are handing to someone, down on a clean surface, and let the other person pick it up."

One OSHA rule needs the course's question. It says, "Cut in the direction away from the body. Keep your fingers and thumbs out of the way of the cutting line."⁷ This course reads that first sentence as written for trimming and boning in a restaurant, where a blade drawn towards you can end in your stomach. At a home board, the blade travels down into the board and forward or back along it, not towards you, and the part that protects you is the second sentence: keep your guiding hand out of the line the blade will travel. That's what the claw does. When you are paring something in your hand, though, the first sentence applies in full.

Wood or plastic

Plenty of people believe plastic boards are more hygienic than wood, on the grounds that wood is porous and bacteria hide in it. It was tested in 1994 at the University of Wisconsin-Madison by Nese Ak, Dean Cliver and Charles Kaspar. They put E. coli, Listeria and Salmonella on boards of nine hardwoods and four plastics, new and used.¹¹ Clean wood absorbed the bacteria within 3 to 10 minutes, and at low and moderate doses they "generally could not be recovered after entering the wood". At a high dose some survived for 12 hours, but their numbers were "reduced by at least 98%, and often more than 99.9%". On plastic, bacteria survived and multiplied overnight if the board stayed moist. The authors concluded: "These results do not support the often-heard assertion that Plastic cutting boards are more sanitary than wood".¹¹

Their companion paper found new plastic easy to clean, but knife-scarred plastic hard to clean by hand, especially with chicken fat on it.¹¹ Cliver's later review repeated that knife-scarred plastic is "very difficult to clean and disinfect".¹¹ On the other side, studies of wooden boards in Hong Kong wet markets, cleaned only by scraping, found harmful bacteria on them. That shows poor cleaning fails on wood as it does on anything; those studies did not compare wood with plastic.¹¹

So this is a contested question that leans one way, and the way it leans is "either." FSIS says so: "Consumers may choose either wood or a nonporous surface cutting board such as plastic, marble, glass, or pyroceramic. Nonporous surfaces are easier to clean than wood."¹² Wash either kind with hot soapy water and dry it, and replace a plastic board when it's deeply scored. The step that matters more than the material is the one FSIS adds: one board for produce and bread, and "a separate one for raw meat, poultry, and seafood."¹² Lesson 4 is about that, including how to manage with one board.

Mise en place

Mise en place is French for, in the Escoffier School's translation, "everything in its place."⁵ The school gives the goal as having "everything ready to go when it comes time to cook, bake, or assemble your final dish."⁵ In practice it's four steps, in this order:

1. Read the recipe all the way through first, method as well as ingredients.⁵
2. Get the tools out: the board steadied, the knife honed, a pan, a spoon, a bowl for scraps.
3. Get the ingredients out and measure them, each into its own bowl or small pile.⁵
4. Do the prep: wash, peel, and cut everything to its size before any heat goes on.

Here's why this belongs in a lesson about knives. Once a pan is hot, things happen on the pan's schedule rather than yours: whatever is in it keeps cooking while you look for the next ingredient. If you're cutting while something cooks, you're cutting in a hurry, with your eyes on the stove, which is the interrupted-knife problem OSHA's rule is about. Doing the cutting first means it happens calmly, at a board that isn't moving, with your attention on your hands.

The school also lists the ways mise en place goes wrong. Prepping too far ahead is one, because "vegetables can lose their crispiness, herbs may wilt".⁵ Another is uneven cutting, for the reason this lesson has already given: "Uniformity is important when slicing and chopping ingredients as it helps the food to cook evenly."⁵ A third is skipping the full read-through and finding a missing step halfway.

What people get wrong

"A dull knife is safer, because it can't cut you as badly." A dull knife does less damage per stroke, but it needs more force, and more force is what makes a blade skid off the food and into your hand. The force difference is measured; the injury difference is professional consensus built on it.¹⁷⁹

"Catch a falling knife before it hits the floor." It's the reflex, and it's the wrong one. Let it fall and step back.⁷

"Plastic boards are more hygienic than wood." The lab work doesn't support it, knife-scarred plastic is hard to clean, and FSIS says either will do. Keeping raw meat on its own board matters more than the material.¹¹¹²

"The classical cuts are for show." Some are used for looks, but mostly they're a size vocabulary, and size sets cooking time. A recipe that says "small dice" is telling you how long the pieces will take.¹⁴

"A steel sharpens a knife." It realigns an edge that has bent over. When the edge itself has worn away, only a sharpener or stone brings it back.¹¹⁰

Practice

Connections

Time Management's third lesson measured how far people's predicted times fall short of their actual ones on real tasks. Cooking is a good place to test your own ratio: time your mise en place against your guess, and you'll probably find the cutting takes longer than you thought, which is another reason to do it before the pan is hot. Habits and Self-Discipline taught that a behaviour repeated in a stable context becomes automatic; the claw is meant to become one of those, which is why it's worth practising slowly until your hand does it without being asked.

Logic and Argument's habit of asking what a claim rests on did the work in the section on sharp knives. "A sharp knife is safer" turned out to rest on a measured force difference and a mechanism, not on counted injuries, which is enough to act on and worth knowing.

Lesson 2 explains why size sets cooking time: heat enters from the surface, and thickness changes how long it takes to reach the centre. You'll measure it yourself with two slices of potato. The course's question comes back there with a name, and in every lesson after.

Go deeper

• Jacques Pépin, "Proper Knife Skills for Cutting, Chopping and Slicing", KQED, about 4 minutes. The best next thing to watch after this lesson, from the same series as the sharpening video above. This course checked its title, channel and length. The whole KQED playlist includes trussing and carving a chicken, which lesson 7 uses.
• America's Test Kitchen, "A Guide to Using Your Chef's Knife", Liz Bomze, 2018. Read here in full. The grips, the cutting motions and honing, with photographs of each, which help more than any description.
• University of Kentucky, "Knife Skills", a free eight-page handout. Read here in full. A short summary to keep by the board.

Sources

1. Liz Bomze, "A Guide to Using Your Chef's Knife", America's Test Kitchen, 5 December 2018, https://www.americastestkitchen.com/articles/1362-a-guide-to-using-your-chef-s-knife. Read level: full text, downloaded directly (SOURCES Part D 1 and "Gate closures, lesson 1"). Supports: the handle grip, pinch grip and claw, the cutting motions, the flat stable surface, the aim of even pieces, the dull-knife mechanism, honing against sharpening, the honing method and angle, the paper test and the honing routine.
2. The Editors of America's Test Kitchen, "How to Cut an Onion", https://www.americastestkitchen.com/articles/229-how-to-cut-an-onion. Read level: full text, direct. Supports: the onion method, leaving the root on, the spacing of cuts, and ATK's recipe size vocabulary.
3. University of Kentucky, "Knife Skills" handout (Eat Well UK), 2023, https://eatwell.uky.edu/sites/default/files/2023-03/knife%20skills-3.pdf. Read level: full text. Supports: the damp towel or anti-slip mat. Repeats ATK's grip wording, so not independent of 1.
4. Escoffier School of Culinary Arts, "Knife Skills: 10 Knife Cuts Every Professional Cook Should Know", 7 March 2024, updated 26 March 2026, https://www.escoffier.edu/blog/culinary-arts/8-knife-cuts-every-professional-cook-should-know/. Read level: full, through a summarising fetch tool. Supports: the sizes in the table. The metric conversions are this course's.
5. Escoffier School of Culinary Arts, "What Is Mise en Place and Why Is It So Important to Chefs?", 18 October 2024, modified 18 February 2026, https://www.escoffier.edu/blog/culinary-arts/what-is-mise-en-place-and-why-is-it-so-important-to-chefs/. Read level: full text, direct. A school's own blog. Supports: the translation, the goal, the steps and the common mistakes. The details added to steps 2 and 4, and the reasons in the paragraph after the list, are this course's.
6. Douglas Baldwin, "A Practical Guide to Sous Vide Cooking", version 0.4k, last updated 2014, https://douglasbaldwin.com/sous-vide.html. Read level: full. Supports: the thickness quotation. Its application to vegetables in a pan is this course's inference, as the body says.
7. US Occupational Safety and Health Administration, "Young Worker Safety in Restaurants eTool: Food Preparation", section "Knives and Cuts", https://www.osha.gov/etools/young-workers-restaurant-safety/food-prep. Read level: full text, downloaded directly. Supports: every OSHA quotation. Written for restaurant workers; the reading of "cut away from the body" for a home board is this course's, as the body says.
8. G. A. Smith, "Knife-related injuries treated in United States emergency departments, 1990-2008", Journal of Emergency Medicine 45(3), 2013, pp. 315 to 323, PMID 23849364. Read level: abstract. Supports: the annual and daily figures, the 66% for fingers and thumbs, and the knife-type shares with their denominator.
9. R. W. McGorry, P. C. Dowd and P. G. Dempsey, "Cutting moments and grip forces in meat cutting operations and the effect of knife sharpness", Applied Ergonomics 34(4), 2003, pp. 375 to 382, PMID 12880746. Read level: abstract. Supports: the sample, the grip-force figures and the sharpness finding.
10. The Editors of America's Test Kitchen, "How to Use a Honing Rod", https://www.americastestkitchen.com/articles/276-how-to-use-a-sharpening-steel, and "Knife Tune-Up: How to Use a Honing Rod", https://www.americastestkitchen.com/how_tos/10751-knife-tune-up-how-to-use-a-honing-rod. Read level: full text of both, direct. Supports: why an edge feels dull, light pressure, the paper test's order, and the time and metal comparison.
11. N. O. Ak, D. O. Cliver and C. W. Kaspar, "Cutting boards of plastic and wood contaminated experimentally with bacteria", Journal of Food Protection 57(1), 1994, pp. 16 to 22, and "Decontamination of plastic and wooden cutting boards for kitchen use", the same issue, pp. 23 to 30; D. O. Cliver, "Cutting boards in Salmonella cross-contamination", Journal of AOAC International 89(2), 2006, pp. 538 to 542; and the Hong Kong wet-market studies (Lo and others 2019; Sekoai and others 2020; Ngan and others 2020). Read level: abstracts only. Supports: the board experiments, their conclusion, scarred plastic, and the wet-market counterweight.
12. USDA Food Safety and Inspection Service, "Cutting Boards", last updated 27 August 2024. Read level: full, through an Internet Archive capture of 23 September 2026. Supports: the "either" quotation and the separate board for raw meat.
13. USDA Food Safety and Inspection Service, "Doneness Versus Safety", last updated 10 July 2024. Read level: full, through an Internet Archive capture. Supports: the 15% figure.