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The Prep Room · Kitchen Notes

5 Signs Your Kitchen Knives Are Quietly Ruining Your Cooking

And what the people who cook for a living quietly switched to instead.

By the Prep Room team·Updated 17 August 2026·4 min read

Slicing a tomato cleanly with the Minato Japanese santoku knife

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You've probably blamed yourself. The onion that turned to mush. The tomato you had to saw through. The herbs that went brown before they hit the pan. You assumed it was your technique.

It almost never is. It's the knife — and more specifically, the steel it's made from. Here are the five tells that your knives are working against you, and what the people who cook for a living use instead.

You're sawing, not slicing.

A ripe tomato should fall open under the blade's own weight. If you're pressing down and dragging back and forth, the edge is too dull or too soft to bite cleanly. Good knives glide; tired ones tear.

Softer Western steel (typically 52–55 HRC) can't hold a fine enough edge.

Your hand aches after ten minutes of prep.

Prep shouldn't be a workout. If you're white-knuckling the handle and your wrist is done before the veg is, the knife is poorly balanced and you're compensating with brute force.

Cheap knives put the weight in the wrong place, so you do the work the blade should.

You sharpen it constantly — and it never lasts.

You bought a sharpener, you use it, and three meals later it's blunt again. That's not you failing to sharpen properly. That's soft steel that simply won't hold an edge.

Edge retention comes down to steel hardness — and most kitchen knives just aren't hard enough.

Before and after: a dull knife crushes a tomato versus clean slices from the Minato

Left: what a dull, soft blade does. Right: a clean cut from a properly hard Japanese edge.

Your herbs bruise and go brown.

Basil that blackens, parsley that wilts on the board. A truly sharp blade severs cleanly; a dull one crushes the cells, and crushed herbs oxidise and taste flat.

A coarse edge mangles rather than cuts.

You've started to dread cooking.

The quiet one. When your tools fight you, prep stops being satisfying and starts being a chore you put off. The right knife does the opposite — it makes you want to cook.

Here's what the big knife brands won't tell you.

The difference isn't the price tag or the logo. It's the steel.

Japanese knives are forged from far harder steel — the Minato uses AUS-10 steel hardened to 60 HRC — which takes a dramatically finer edge and, crucially, holds it. That's why a chef's knife from Japan can glide through a tomato skin months after its last sharpen, while a Western knife needs babysitting.

The everyday all-rounder

Meet the Minato 7″ Santoku

British-designed, Japanese AUS-10 steel — the knife that handles ~90% of what you do in a kitchen: veg, herbs, meat, fish. The one most people should have bought first.