Brains à la Robert

Cervelles à la Robert (poached brains with mustard cream and celery) teaches the quiet discipline of cold saucing. The one true thing is temperature: the brains must be cooked gently, then chilled until fully firm before a knife touches them. Warm brains smear; cold brains cut into tender, regular slices that can carry a proper mask of sauce.

The classical entry assumed a garde-manger, a cold-larder cook, working beside a saucier with mustard-and-cream sauce already waiting, enough brains to fill a service platter, and a fine tamis for the trimmings. There is no need for a stockpot that never goes cold or a salamander, because court-bouillon, not stock, does the poaching and the dish is served cold. At home, one nonreactive saucepan and a sturdy fine sieve do the work. The brigade quantities and separate stations are scaffolding and can go; the court-bouillon, the sieved remains, and the white celery julienne are the dish and must stay.

When it is right, the slices are pale and tender beneath an ivory sauce sharpened with Dijon, while the celery answers with a clean snap. Two brains make four generous starters, scaled for one cook, one stove, one evening. Poach at a tremble, then chill completely before slicing; that is the step that decides the plate.