Still, shiver, boil

Read the surface, not the dial

Every stove lies about its numbers, so cooks read the liquid instead. Still with steam is around 70–80 °C, poaching territory. The occasional lazy bubble is a simmer. A surface churning with bubbles is a full boil — a genuinely different tool, not merely a faster one.

Worth remembering One bubble every second or two is a simmer. More than that is a boil.

Why a boil ruins meat

Boiling water is only about fifteen degrees hotter than a simmer, but muscle fibres contract hard in that range and squeeze their water out. A boiled stew ends up stringy and dry in the middle of a pot of liquid, which feels like a contradiction until you know that. The physical churning also smashes things apart and clouds a stock with emulsified fat.

Worth remembering When meat is tough, cook it longer and gentler — never hotter.

How deep changes what it is

Fully covered, the food only ever reaches the liquid’s temperature — that is poaching or simmering. Half covered, the exposed top browns in the oven’s dry air while the bottom stays gentle: that is a braise, and it is why a braise wants a lid on and a pot only part-filled. Sitting on top of the water is steaming, hotter and faster than either.

1. Sitting on top
2. Half in
3. Fully under

Worth remembering Fully under, half under, above: three different techniques, one pot.

Stopping is a step too

Food does not stop cooking when it leaves the pot — it carries enough stored heat to keep going for minutes. For green vegetables that is the difference between vivid and drab, which is why blanching is always two moves: a hard fast boil, then straight into ice water. The ice half is not optional garnish; it is the half that sets the result.

Worth remembering Blanching is boil AND shock. Skip the shock and you skipped the technique.