Gratins

Les gratins (dishes finished beneath a browned crust) teach one true thing: the food below and the heat above must finish together. A bronze surface means nothing if the centre is cold, raw, or swimming in thin sauce. The classical forms simply organize that relationship: gratin complet (Complete Gratin), gratin rapide (Rapid Gratin), gratin léger (Light Gratin), and glaçage (Glazing), itself a form of rapid gratin.

The classical working kitchen could call for hot cooked ingredients, a finished sauce held by a saucier, and a salamander fierce enough to colour the surface in moments. Your honest equivalents are one saucepan, four shallow dishes, and the broiler already built into the oven. The source is a map of the operation rather than a fixed formula, so potatoes become the neutral teaching base and the batch is scaled to four servings. One cook, one stove, one evening.

The gratin complet cooks raw potato beneath its crust. The other three begin with potato already cooked and hot, because their brief top heat is meant to finish, not to cook. Matching the readiness of the centre to that final burst of heat is the step that matters most, and once the broiler is on, you stay beside it.