Poisson Braisé — Fish Braised on a Bed of Aromatics

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Fish braising occupies the middle ground between poaching and roasting — the fish sits on a matignon (finely diced aromatic vegetables) with liquid reaching halfway up the piece, covered, and cooked gently in the oven at 160-170°C. Unlike shallow poaching (which uses a thin layer of liquid and high oven heat), braising employs more liquid, lower temperature, and longer cooking — suited to firmer, meatier fish like turbot, monkfish, or large sections of salmon. The technique begins with sweating the matignon (onion, carrot, celery, and mushroom stalks, cut brunoise) in butter until softened, approximately 5 minutes. The fish, seasoned and placed on the vegetable bed, is moistened with fish fumet and white wine to half its height. A buttered cartouche is placed directly on the fish, the lid sealed, and the braisière placed in a moderate oven. A 600g turbot section requires 25-30 minutes at 165°C, reaching 62°C internally. The braising liquid, enriched by vegetable sweetness and fish gelatin, becomes the sauce foundation. After removing the fish, the liquid is strained, reduced by half, and finished with cream, butter, or a liaison of egg yolks and cream. The matignon itself may be puréed into the sauce for body or served alongside. Braised fish has a distinctly different character from poached — more concentrated flavour, a slightly firmer texture from the moderate heat, and a sauce with greater depth and complexity from the caramelised vegetables and extended cooking.

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