Filets de Soles Catalane

Filets de Soles Catalane (sole fillets Catalan-style) teaches that a reduction can be the whole sauce. The one true thing to know before touching a pan is this: the poaching liquor must be reduced far enough to concentrate, but not salted so heavily that concentration turns it briny. Measure it before the butter goes in. Guessing is how this delicate sauce becomes either thin broth or a salt lick.

The formula assumes a fish fumet always ready, a saucier reducing it while another cook plates the sole, and a salamander waiting with fierce top heat. A home kitchen needs one wide pan, a small saucepan, and a fully heated broiler. The brigade's extra pans and holding time are scaffolding, so they go; the hollowed tomatoes, onion cooked without colour, last-minute poach, exact butter ratio, and fast glaze are the dish, so they stay. Eight small fillets make four generous servings. One cook, one stove, one evening.

Done properly, each red tomato cup carries a spoonful of sweet translucent onion and a folded ivory fillet, all caught beneath a butter-gold glaze that gleams rather than smothers. Have the platter warm and the broiler ready before the sole enters its fumet. The measured reduction is the step that decides everything.