Cooking with chocolate

Almost everything that goes wrong in a kitchen follows from that one sentence, so it is worth unpacking before anything else.

THE FAT IS COCOA BUTTER, and it is unusual. It is solid and brittle at room temperature, fully liquid a little below body temperature, and it makes that transition across a narrow range rather than softening gradually the way butter does. That is why chocolate snaps and why it melts in the mouth, and it is why a chocolate left in a warm room is a puddle while a butter icing in the same room is merely soft.

IT ALSO CRYSTALLISES IN SIX DIFFERENT FORMS, of which exactly one gives snap, gloss and stability at room temperature. Melted chocolate left to set on its own picks the wrong ones, which is what tempering exists to prevent — and why bloom, the dull grey film on old chocolate, is not spoilage but the fat rearranging itself into a form it prefers.

AND THE SOLIDS ARE SUSPENDED IN IT, not dissolved. Sugar, cocoa particles and milk powder are all sitting in the fat as fine dry particles. Introduce a small amount of water and those particles wet, clump and lock together — which is seizing, and it is why a drop of water ruins a bowl of melted chocolate while a whole cup of cream does not.

Melting, tempering, seizing, blooming, splitting, dipping and moulding are all consequences of those three facts. Learn them once and the rules stop needing to be memorised.

This is the most consistently useful thing on this page and it runs against instinct.

A baked product destroys most of what makes a fine chocolate fine. The delicate fruit and floral volatiles that distinguish a good single-origin bar are exactly the compounds an oven drives off, and what survives — cocoa solids, cocoa butter, bitterness, colour — is what a supermarket dark chocolate also supplies at a fraction of the cost.

What a recipe actually cares about is COMPOSITION rather than quality. A ganache needs a predictable fat content, because the fat is what sets it. A chip cookie wants a chocolate formulated not to melt. A coating wants enough cocoa butter to flow thinly, which is what couverture's higher fat content is for. A brownie wants cocoa solids and does not care where they came from.

So the honest advice is: bake with good ordinary chocolate, and eat the expensive bar. The one place fine chocolate genuinely rewards you is anything uncooked and barely sweetened — a ganache, a mousse, a truffle, a plain hot chocolate — where the flavour reaches you intact.