Sole Marinière

Sole marinière (mariner's sole) teaches the liaison, the calm binding of a reduced cooking liquor with velouté, egg yolks, and butter. The one true thing to know before touching the pan is this: the yolks must become warm enough to thicken, never hot enough to boil. Keep them calm and the sauce turns ivory, glossy, and supple around sweet sole and briny mussels.

The original formula assumed a saucier at the next station, fish stock never off the fire for velouté, and a salamander waiting to glaze each order. At home, have two tablespoons of finished fish velouté ready, poach two whole soles in one broad dish, and use the broiler for the final flash. The separate sauce station and prolonged hot holding are brigade scaffolding, so they go. The equal measures of white wine and clear mussel liquor, the reduction by half, the yolk liaison, and the full butter finish are the dish, so they stay. For four servings, the entry's one-sole proportions are doubled around two market soles, each serving two once lifted from the backbone. One cook, one stove, one evening.

Everything is arranged so the final minutes belong to the sauce. Temper the yolks away from direct heat, mount the butter off the fire, and glaze in seconds rather than minutes. Keep the yolks calm; that liaison is the step that decides the dish.