Poaching & SteamingPocher et Cuire à la Vapeur

The most French, the most misunderstood

Ask a home cook to name a French cooking method and they will say sauté, or roast, or reduce. Almost nobody says poach, and yet poaching and its cousin steaming underpin more of the classical repertoire than any other heat — the whole of the fish station, most of the egg station, the great family pots, and every fruit dessert that isn't baked.

The reason it goes unnoticed is that poaching looks like nothing is happening. There is no sear, no colour, no fond to deglaze, no dramatic hiss. A liquid sits at a near-silence and something cooks inside it, evenly, all the way through, without ever toughening on the outside before the centre catches up. That evenness is the entire point. A steak wants a violent exterior and a gentle interior; a fillet of sole wants gentleness everywhere, because its structure cannot survive anything else.

The misunderstanding is thinking gentle means imprecise. It is the opposite. A rolling boil forgives you a few degrees either way — it is already at the only temperature water can reach at sea level. A frémissement (a shiver) has no such safety net: five degrees too hot and you have simmered instead of poached, and a poached egg becomes a boiled one, ragged and tough. Precision at low heat is a discipline of watching, not of thermometers, and that watching is what this page teaches.

Frémir to rolling boil, by eye

Water and stock pass through four recognisable states between cold and a hard boil. French classical training names each one and expects a cook to move between them by sight, because a thermometer left in a pan of court-bouillon gets in the way of the fish going in and out.

• Frémir — the shiver (75–85°C). The surface trembles rather than moves. A single small bubble rises from the base every few seconds and dies before it reaches the top. Nothing breaks the surface. This is the temperature for œufs pochés and for any fish so delicate it would tear at anything hotter.
• Poaching heat (85–92°C). A scatter of small bubbles rises steadily from the base and bursts gently at the surface, which now has a faint, lazy movement to it — like a pond in a light wind rather than glass. This is the working temperature for most poached fish, chicken breasts, and fruit in syrup.
• Gentle simmer (92–96°C). Bubbles are larger, more frequent, and visibly disturb the surface without breaking it into froth. This is where a pot-au-feu or a stock lives for hours — too vigorous for delicate protein, exactly right for anything that needs long, slow extraction.
• Rolling boil (100°C at sea level). Big bubbles from the base, constant surface turbulence, steam rising freely, noise. Correct for pasta, blanching, and reducing a sauce hard — wrong for almost everything else on this page.

Court-bouillon

A court-bouillon — literally "short broth" — is the seasoned, acidulated water that fish, offal and some vegetables are poached in. It is not a stock, and confusing the two is the single most common mistake made by home cooks reaching for this technique.

A stock is built for hours from bones to extract gelatine and body, and it is a finished ingredient in its own right. A court-bouillon is built in twenty minutes from aromatics and acid, exists purely to season and protect whatever is poached in it, and is usually discarded or reduced afterwards rather than served as is. It has no meat, no bones, and no long cooking — long cooking would only concentrate vegetable bitterness with nothing to balance it.

Poaching fish, whole and in fillets

Fish flesh is held together by very little connective tissue, which is why it flakes so readily and why it punishes rough handling. Poaching is kind to it precisely because there is no agitation to break the flakes apart before they are meant to separate.

Whole fish

Start a whole fish — salmon, sea bass, trout — in cold court-bouillon, not hot. A large fish dropped into liquid already at temperature cooks unevenly: the outer flesh is overdone by the time heat has travelled to the bone at the centre. Starting cold lets the fish and the liquid heat together, so the whole fish reaches doneness within moments of itself. Bring to a bare frémir, then hold it there — never above 85°C — for roughly 10 minutes per kilo, measured at the thickest point.

Fillets and steaks

A fillet is thin enough that it has no need of the slow, shared warm-up a whole fish needs. Bring the court-bouillon (or, for a simpler approach, well-seasoned water with a squeeze of lemon and a bay leaf) to a frémir first, then lower the fillet in. It will be done in 4–8 minutes depending on thickness. Flat fish such as sole take the least time of all.

How to tell it is done, with nothing but your senses

• The flake test. Press a fork or the back of a spoon gently into the thickest part. Cooked fish separates into clean, opaque flakes with almost no resistance. Raw fish resists and looks glassy or translucent between the flakes.
• The bone test, for whole fish. At the point behind the head, where the flesh is thickest, slide a thin knife down to the backbone and gently lift a flake away from it. If it lifts cleanly from the bone, it is done; if it clings, give it another minute or two.
• The skewer-to-lip test. Push a skewer into the thickest part, leave it three seconds, then touch it to your lower lip — the most sensitive skin you have. Warm through means done; cold at the centre means not yet; hot enough to flinch means you have overshot.

Poaching chicken without chalk

Poached chicken breast has a poor reputation entirely because it is usually cooked wrong. Boiled hard, a chicken breast tightens, expels its moisture, and turns into the dry, chalky texture everyone associates with "diet food." Poached properly, it is silken, and this is a technique failure, not an ingredient failure.

Poule au pot and pot-au-feu

Poule au pot — hen in the pot — and its beef cousin pot-au-feu are the family meal at the heart of French home cooking: a whole bird or a tough cut of beef, simmered gently with vegetables until both the meat and the broth are worth eating, served as two courses from one pot.

The governing principle is the opposite of poaching a fillet: this is long, gentle simmering — 92–96°C, not a frémir — for the two to three hours a whole hen or a cut like beef shin needs to turn tender. Start the meat in cold, well-salted water so that flavour moves in both directions between meat and liquid, rather than sealing the meat's surface and trapping flavour inside it as a hot start would. Skim the grey foam that rises in the first twenty minutes scrupulously — it is coagulated protein and carries no flavour, only cloudiness — then add the vegetables (carrots, leeks, turnips, celery, whole onion studded with a clove) partway through so they finish exactly as the meat does.

Serve the broth first, with the vegetables, then the meat carved at the table with coarse salt, mustard and cornichons. This is the same family of technique as Stocks and shares its logic entirely — a pot-au-feu is, in effect, a stock you also intend to eat the solids from.

Œufs pochés

The poached egg is the frémir test in miniature, and everything said above about the shiver applies at its most exacting here. For the full method — the vinegar water, the whirlpool, the fresh-egg test, and the fault list for ragged whites — see Eggs. The principle to carry from this page is the same one: a poached egg cooked at a true frémir holds a tight, tender shape; cooked at even a light simmer, the white shreds into rags before the yolk is set.

Poaching fruit

Pears in wine — poires au vin — are the clearest teaching example of poaching fruit, and the same syrup and method apply to peaches, quince, and firm apples.

Bring the syrup to a bare poaching heat — 85–92°C — before the fruit goes in; too hot and the outside collapses before the centre softens. Peel the pears, leaving the stalk on for presentation, and lower them in whole or halved. Cut a round of baking paper to the diameter of the pan with a small vent hole in the centre — the cartouche — and lay it directly on the surface of the syrup. It holds the fruit just submerged without a lid trapping too much heat, and stops a dry, discoloured cap forming above the liquid line where the fruit pokes through.

Poach 20–35 minutes depending on ripeness; a skewer should meet gentle, even resistance the whole way through, not the total absence of resistance you'd want from a purée. Lift the fruit out, then reduce the poaching syrup hard, at a full boil now that the fruit is out of it, until it coats the back of a spoon — this is the sauce.

Shallow poaching à la nage

À la nage — literally "swimming" — is shallow poaching: a small amount of well-flavoured, buttered liquid, just enough to come partway up the fish, simmered in a covered pan on the hob rather than submerged in a full court-bouillon. It is the standard restaurant method for fillets, because the poaching liquid and the sauce become the same thing.

Steaming without a steamer basket

Steam carries heat efficiently and touches food without a drop of liquid, which is why it is the gentlest of all the moist methods and the one that changes flavour least. You do not need a dedicated steamer to use it.

• A sieve over a pan. A metal sieve or colander set over a saucepan of simmering water, with a lid or a dome of foil over the top, steams vegetables and fish perfectly well. Keep the water level below the base of the sieve.
• A plate on ramekins. Stand two or three upturned ramekins or heatproof cups in a wide pan with 3–4 cm of simmering water, rest a plate on top, and put the food on the plate. This is the method for delicate things — a whole fish, a custard — that would fall through a sieve's holes or need to sit level.
• A folded-foil trivet. Fold a double sheet of foil into a long ridge, coil it into a flat ring about 3 cm high, and stand it in the base of a pan with water below its top edge. A plate or a heatproof bowl sits on the ring. This is the method when you have no ramekins and no sieve at all.
• The improvised couscoussier. The real couscoussier is a two-part pot, a stew simmering below and a perforated steamer basket of grain above, sharing the same rising steam and aroma. A large stockpot with a metal colander that sits snugly in its rim, covered with a damp cloth pressed around the join to stop steam escaping around the sides, does exactly the same job.

Steaming in paper — the papillote as a whole method

Fish en papillote — in a paper parcel — is steaming taken to its most self-contained form: the food, a little liquid or butter, and its own released juices are sealed inside folded baking paper and roasted in a hot oven, so the parcel puffs with trapped steam and the fish or vegetables inside cook by that steam alone, sealed away from the dry oven air. It deserves to be thought of as a whole method in its own right, not a garnish on roasting, because nothing about it is dry heat — everything that happens inside the parcel is a fast, hot version of the sieve-over-a-pan idea above.

Blanching, refreshing, and why the ice bath matters

Blanchir — blanching — is a brief plunge into fast-boiling, heavily salted water, followed immediately by rafraîchir, refreshing in iced water. The two always go together; one without the other is not the technique, it is half of it.

Blanching does several different jobs depending on what is in the pot: it sets the bright chlorophyll green of a vegetable before heat has time to dull it, it loosens the skin of a tomato or an almond for peeling, it firms and partly cooks something that will finish by another method later, and it draws out excess salt or bitterness from bacon or certain vegetables. In every case, the plunge into iced water afterwards stops the cooking dead. Without it, residual heat inside the vegetable keeps cooking for several more minutes on the way to the colander, turning bright green beans a dull khaki and taking a firm carrot past crisp-tender into soft.

See Vegetables for the full method and the chemistry of why green vegetables lose colour under sustained heat and acid — the short version is that chlorophyll's magnesium centre is knocked out by heat and acid together, turning green to khaki, and a fast blanch followed by an immediate ice bath is the only defence.

On sous-vide, honestly

Sous-vide — cooking sealed under vacuum in a precisely controlled water bath — is, at bottom, poaching with a machine doing the watching for you. It is a genuinely useful piece of restaurant technology for certain narrow jobs, and it is entirely unnecessary in a home kitchen for anything taught on this page.

What sous-vide buys you is the ability to hold something at an exact temperature for hours without attention. What it costs you is a specialised, single-purpose machine, plastic bags, and — for anything that benefits from a seared crust — a second pan afterwards anyway. A cook who has learned to read a frémir by eye, rest chicken breast off the heat, and pull fish at the flake test has already bought, for nothing, the one thing sous-vide actually sells: control over gentle heat. Practise the eye instead of buying the machine.

When it goes wrong