The Four Cuts You Actually Need
Chop, dice, slice, chiffonade — and why each one matters
Knife technique is not about speed. It is about consistency of size, which determines consistency of cooking. Unevenly sized pieces cook unevenly. This is the only principle you need.
Knife work in professional kitchens has its own vocabulary and hierarchy — brunoise, julienne, paysanne — but most of this is restaurant-specific. What actually matters for home cooking reduces to a much shorter list: four cuts that appear in practically every recipe.
The underlying principle connecting all of them is the same: consistent size means consistent cooking. Pieces of unequal size cook at different rates. Some will be overcooked before others are done. This is why a recipe says "finely diced onion" rather than "roughly chopped onion" — not for aesthetics, but because the cooking time and the resulting texture are genuinely different.
The chop
The bluntest instrument. Used when precise size is not critical — crushing garlic, breaking up tomatoes for a rough sauce, preparing aromatics that will be blended or strained.
Technique: use a rocking motion with the tip of the knife anchored to the board. The heel of the blade rises and falls. Keep the fingers of your guide hand curled under (the "claw grip") with the flat side of the blade resting against the first knuckles. This prevents any contact between blade and fingertips regardless of speed.
The dice
The workhorse cut. Small dice (around 5mm), medium dice (8–10mm) and large dice (12–15mm) are all versions of the same method.
Technique: cut the vegetable into even slices, then cut those slices into even batons, then rotate 90° and cut the batons into cubes. The key is making the initial slices even in thickness — everything downstream follows from this.
For onions specifically: halve the onion through the root, peel, then make parallel cuts toward (but not through) the root, then horizontal cuts (optional for large onions), then slice across all the cuts. The root end holds the layers together throughout.
The slice
For vegetables that will be cooked whole or in rounds — courgettes, carrots, mushrooms, leeks. The goal is consistent thickness so every piece takes the same time.
Technique: same claw grip. For round vegetables, make one flat cut first to create a stable base, then slice against it. The mandoline is an alternative for very thin, very consistent slices, but a sharp knife with a consistent rolling motion works for most purposes.
The chiffonade
For leafy herbs and greens — basil, mint, spinach, cabbage. Stack the leaves, roll them into a tight cylinder, then cut across in thin ribbons.
The practical reason: cutting herbs with a flat chop bruises and blackens them. The chiffonade cuts quickly and cleanly without compressing the leaves, preserving both colour and flavour.
Knife sharpness
None of this is possible with a blunt knife. A sharp knife requires less force, which means more control. It slips less easily from curved surfaces (which is why blunt knives cause more injuries — they slip off the rounded surface of an onion far more readily than a sharp one).
Honing (with a honing steel, used weekly) realigns the edge without removing metal. Sharpening (with a whetstone or pull-through sharpener, used every few months) removes metal to restore the edge. Most kitchen knives need honing far more than sharpening — but once truly blunt, honing will not help.
One sharp, well-maintained chef's knife does more in a kitchen than a full block of dull ones.