Pochage au Fumet — Shallow Poaching of Fish Fillets

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Shallow poaching is the poissonnier's most versatile and refined technique, the basis for scores of classical fish preparations from Sole Bonne Femme to Filets Véronique. Unlike deep poaching, the fish sits in a shallow layer of liquid — typically fumet, white wine, and shallots — that comes only one-third up the fillet. The pan is covered with buttered cartouche (parchment) and placed in a 180°C oven or held on the stove at a gentle simmer. The fillet cooks simultaneously from below (conduction through liquid) and above (steam trapped under the cartouche), reaching 62°C internal in 8-12 minutes for a standard 150g sole fillet. The genius of the method is that the cooking liquid, now concentrated with fish gelatin and flavour, becomes the cuisson — the foundation of the accompanying sauce. After removing the fish to a warm platter, the cuisson is reduced by two-thirds, enriched with cream or velouté, and finished with cold butter (monter au beurre) to create a glossy, nappant sauce. The standard mise en place: butter the sauteuse or plat à sauter, scatter finely minced shallots (15g per portion), lay fillets presentation-side down, add fumet and wine in equal parts to one-third depth (roughly 100ml each for 4 fillets), season, cover with buttered cartouche, and cook. The fish is turned presentation-side up for service, napped with the finished sauce, and optionally glazed under the salamander.

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