In 18 years of professional cooking — from Michelin-starred kitchens in New York to Tokyo — I've trained dozens of cooks. The single most impactful skill I've taught, every time, is knife technique. Not flavour theory, not recipe knowledge: the ability to cut efficiently, safely and consistently changes everything about how someone cooks.
A cook who can dice an onion in 90 seconds versus 8 minutes is not just faster — they're less stressed, more in control, and produces more consistent results because uniform cuts cook evenly. This guide covers the seven cuts you'll use in 95% of all cooking, plus the foundational skills that make all cutting safer and more effective.
The Foundation: Grip, Stance and Board Setup
Before any cutting technique: the pinch grip. Do not hold the knife by the handle — grip the blade itself between thumb and forefinger, just in front of the bolster (the thick part where blade meets handle). Wrap the remaining fingers around the handle. This feels counterintuitive but provides far greater control than a handle grip.
Your non-knife hand forms the 'claw': curl your fingertips under, keeping knuckles forward. The flat of the blade rests against your knuckles as a guide — they protect your fingers. The knife never lifts above the level of the knuckles.
Stance: stand square to the board, feet shoulder-width apart. The board should be stable — place a damp cloth underneath to prevent slipping. Your board should be large enough that food doesn't fall off the edges. In a professional kitchen, small cutting boards are considered dangerous.
A sharp knife is safer than a dull one. A dull knife requires more pressure — more pressure means more chance of slipping. Sharpen your knife monthly and hone it before every session.
The 7 Essential Cuts: Explained with Dimensions
**1. The Rough Chop:** For aromatics (onion, garlic, herbs) that will be blended or strained. Cut in halves, then quarters, then in rough 1cm pieces. Precision is irrelevant — speed and efficiency are the goals.
**2. The Chop:** Standard 1–2cm pieces for general cooking — potatoes, carrots, peppers. Halve the ingredient, stabilise flat-side down, then make parallel vertical cuts, then horizontal cuts across.
**3. The Dice:** The king of cuts — produces uniform cubes for even cooking. Small dice: 6mm. Medium dice: 12mm. Large dice: 20mm. Technique: julienne first (see below), then turn 90° and cut across the julienne strips.
**4. The Julienne (Matchstick):** Thin uniform strips, typically 3mm × 3mm × 6cm. Essential for stir-fries, salads and garnishes. Create a flat edge, make parallel slices 3mm thick, then stack and cut into 3mm strips.
**5. The Brunoise:** Tiny 3mm cubes — the finest dice, used for garnishes and fine sauces. Produced by cutting julienne into cubes. Requires a sharp knife and patience.
**6. The Chiffonade:** For leafy herbs and greens. Stack leaves, roll into a tight cylinder, then cut perpendicular to the roll into thin ribbons. Beautiful for basil, mint and kale.
**7. The Slice:** For proteins, bread, cooked vegetables. Use a rocking motion, keeping the tip of the blade in contact with the board and rocking the heel down through the food. Let the weight of the knife do the work — don't force.
How to Cut an Onion Properly (The Technique Every Cook Needs)
The onion is the most commonly cut vegetable in cooking, and the most commonly cut poorly. Here is the professional technique:
1. Halve the onion through the root end — keep the root intact throughout. 2. Peel and place flat side down. 3. Make horizontal cuts parallel to the board (2–3 for small dice, 4–5 for fine dice), stopping before the root. 4. Make vertical cuts from top to root, stopping before the root. Vary spacing for the dice size you want. 5. Cut perpendicular to your vertical cuts — the dice falls off naturally.
The root holds the onion together throughout — only when you've cut the whole onion do you discard it. This technique, done correctly, produces perfect uniform dice in under 60 seconds for a medium onion.
Chilling an onion for 30 minutes before cutting dramatically reduces eye irritation — cold slows the release of the sulphur compounds that cause tearing.
Knife Care: Sharpening vs Honing — Understanding the Difference
These terms are frequently confused, with real consequences for knife performance:
**Honing (the steel rod):** Does not sharpen. It realigns the microscopic edge of the blade, which folds over with use. Hone before each use — 4–5 passes per side is sufficient. A honing steel keeps your edge performing at its best between sharpenings.
**Sharpening (whetstone or electric sharpener):** Removes metal to create a new edge. A home cook should sharpen 1–3 times per year, depending on frequency of use. Whetstones (starting with 1000 grit, finishing with 3000–6000 grit) give the best results; pull-through sharpeners are faster but remove more metal.
**The paper test:** Hold a sheet of paper vertically. A sharp knife slides through cleanly with no tearing. A dull knife pushes or tears the paper. This simple test tells you immediately whether your knife needs attention.
Key Takeaways
Knife skills are perishable — they require practice to build and maintenance to keep. But unlike most cooking skills, they improve dramatically with consistent repetition of the correct technique. Spend 10 minutes dicing vegetables incorrectly and you'll do it badly for a lifetime. Spend 30 minutes learning the correct technique once, and you'll do it efficiently forever.
My recommendation: buy one good chef's knife (8-inch, German or Japanese steel), learn the pinch grip and the claw, master the dice on an onion, and practice daily for two weeks. The improvement will be immediately apparent — and your cooking will never be the same.
Frequently Asked Questions
German or Japanese knife — which is better for beginners?▼
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About the Author
Professional chef with 18 years of kitchen experience across three Michelin-starred restaurants.