Sauce Vin Blanc — White Wine Fish Sauce

Vin Blanc is the workhorse white wine sauce for fish — simpler than Normande, more refined than Bercy, and present on more restaurant menus than either. It is a fish velouté enriched with the concentrated cooking liquid from the fish itself, reduced with white wine, and finished with cream and butter. The technique is inseparable from the poaching method: the fish and the sauce are made together. Butter a shallow pan (a sautoir is ideal). Scatter finely minced shallots across the bottom. Lay fish fillets on top — sole, turbot, brill, or any firm white fish. Pour over enough dry white wine and fish fumet in equal parts to come halfway up the fillets. Season with salt. Cover with buttered parchment (cartouche) and bring to a bare simmer on the stovetop, then transfer to a 180°C oven for 8-12 minutes depending on thickness. The fish poaches gently while the cooking liquid reduces and concentrates. Remove the fish to a warm plate and cover. Pour the cooking liquid through a fine sieve into a saucepan. Reduce over high heat by two-thirds — this concentrated reduction carries the flavour of the fish, the shallots, and the wine. You should have about 150ml of intensely flavoured liquid. Add this to 250ml of fish velouté. Reduce together until the sauce coats a spoon. Finish off heat with 100ml of heavy cream and 40g of cold butter, swirled until emulsified. Adjust seasoning. The finished sauce should be pale gold, glossy, and taste primarily of the fish it accompanied — the wine providing brightness, the velouté providing body, the cream and butter providing richness. When correctly made, the sauce and the fish are one continuous flavour rather than two components sharing a plate. Vin Blanc is the foundation for many classical fish preparations. Add mushrooms and it moves toward Normande. Add a tablespoon of tomato and it becomes Cardinal. Gratinée it under a salamander and it becomes Glacée. Its simplicity is its genius — it is the starting point for an entire family of fish sauces.