Poaching and simmering are gentle wet-heat methods where food cooks in liquid below boiling point. Poaching operates at 70–82°C — the water barely moves, perhaps a single lazy bubble rising every few seconds. Simmering operates at 85–96°C — gentle, steady bubbles breaking the surface rhythmically but without turbulence. Both exist for a single reason: delicate proteins (fish, eggs, chicken breast, fruit) tighten and squeeze out moisture under aggressive heat. At poaching temperatures, proteins set gently, retaining moisture and producing a silky, tender texture that boiling destroys in seconds. The difference between a poached chicken breast and a boiled one is the difference between silk and rope.
Quality hierarchy: 1) Temperature precision — this is NON-NEGOTIABLE. At a rolling boil (100°C), turbulent water physically batters food apart and the heat contracts proteins so aggressively that they squeeze out moisture like wringing a sponge. At poaching temperature (70–82°C), the water barely moves, proteins set gently around their own moisture, and the texture stays tender and succulent. A thermometer or careful visual monitoring is essential. For poaching: the surface should be still, with occasional bubbles rising from the bottom. For simmering: steady small bubbles should break the surface rhythmically. If the surface is rolling and turbulent, it's too hot. 2) Seasoned liquid — the poaching liquid IS a flavouring agent. It infuses flavour into the food through the same surfaces that are losing moisture. Plain water produces bland results. Court bouillon (water, wine, vegetables, herbs, peppercorns) for fish. Salted stock for chicken. Light sugar syrup with vanilla for fruit. 3) Cold start for even cooking — for chicken breast, the most forgiving method is: place in cold seasoned liquid, bring slowly to a bare simmer (one bubble every 3–4 seconds), hold for 12 minutes, turn off the heat, cover, and let coast for 10 minutes. The gradual heat rise means the outside and inside cook at nearly the same rate. 4) For eggs — poaching eggs has its own specific protocol: fresh eggs (thin whites in old eggs spread into wisps), a splash of vinegar in the water (lowers pH, helps whites coagulate faster), water at a BARE simmer (NOT boiling — turbulence shreds the white), crack into a fine-mesh strainer first to drain watery outer white, slide gently into the water, 3 minutes for runny yolk, 4 for medium.
For the most foolproof poached chicken breast you'll ever make: place breasts in a single layer in a pot, cover with cold chicken stock by 3cm, add a few thyme sprigs and a bay leaf. Set over medium heat and bring SLOWLY to a bare simmer — one bubble every few seconds. The moment it reaches a simmer, turn the heat to the lowest setting, cover, and hold for 12 minutes. Turn off heat. Leave covered for 10 more minutes. The chicken will be 74°C internally, moist throughout, and seasoned by the stock. Slice it — there should be no grey ring of overcooked exterior. It should be uniformly white and juicy from edge to centre. For poached salmon: court bouillon (water, white wine, lemon slices, onion, carrot, thyme, bay, peppercorns), brought to a simmer, salmon gently lowered in, heat reduced to poaching (70–75°C), 8–10 minutes for a 3cm thick fillet. The flesh should flake into large, moist, translucent-centred pieces — not dry, opaque chunks. For poached fruit: light syrup (equal parts sugar and water, simmered until dissolved, with vanilla bean, cinnamon, star anise, or citrus zest). Fruit placed in the warm syrup, held at 80°C for 15–30 minutes depending on firmness. Poached pears should be knife-tender but hold their shape — the syrup infuses flavour while the gentle heat softens without disintegrating.
Boiling instead of poaching — the single most common error. If the water is turbulent, you're boiling. Turn it down until the surface barely moves. Using old eggs for poaching — the white is watery and spreads into wisps that never set properly. Fresh eggs (less than a week old) have thick whites that hold together around the yolk. Not adding vinegar for poached eggs — the acid helps the white proteins coagulate faster, producing a tighter, neater shape. Poaching eggs in vigorously boiling water — the bubbles tear the white apart. Not seasoning the poaching liquid — you're missing an opportunity to add flavour through the same surfaces that are cooking. Overcooking fish — fish poaches in 6–8 minutes for a 2cm thick fillet. At 10 minutes the texture crosses from silky to chalky. There is no recovery. Not using enough liquid — the protein should be comfortably submerged with liquid circulating freely around all sides.