Filets de Sole Marguery — Sole with Mussels and Shrimp Sauce

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Filets de Sole Marguery, created at the Restaurant Marguery in Paris in the 1880s, is one of the great competition dishes of classical French cuisine — sole fillets shallow-poached in fumet and white wine, garnished with mussels and shrimp, and glazed under a sauce enriched with egg yolks and butter to a lustrous, trembling finish. The dish caused a sensation and was the subject of intense culinary espionage — rival chefs attempted for years to decode the recipe. The preparation begins with standard shallow poaching: fillets in a buttered sauteuse, fumet and wine to one-third depth, buttered cartouche, 8-10 minutes at a gentle simmer. The mussels are opened à la marinière (white wine, shallots, parsley) and their strained liquor added to the fish cuisson. Small pink shrimp are peeled and kept warm. The cuisson is reduced by three-quarters, combined with 150ml fish velouté, and brought to nappant consistency. The critical finish: remove from heat, beat in 3 egg yolks mixed with 2 tablespoons cream (liaison), then incorporate 80g cold butter in small pieces while swirling the pan. The sauce must not return to the boil after the yolks are added or it will curdle. Arrange the fillets on a heatproof platter, surround with mussels on the half-shell and peeled shrimp, nap with the sauce, and glaze under the salamander for 30-60 seconds. The surface should develop golden, trembling bubbles — this is the 'gratiner' effect that distinguishes Marguery from simpler preparations.

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