Mousse de Caneton Rouennais

Mousse de Caneton Rouennais (moulded Rouen duckling mousseline) teaches one uncompromising principle: the forcemeat must remain cold enough to hold its emulsion. The forcemeat and the mould are the dish. Keep the first cold, fill the second without trapping air, and the finished mousse will be fine-grained, tender, and rich with duck rather than heavy with separated fat.

The classical kitchen surrounding this entry might have had a saucier, a stockpot never off the fire, and a salamander within reach, but this formula calls on none of them. Its actual brigade scaffolding was a ready batch of poultry mousseline and enough hands to prepare several moulds. At home, the honest equivalent is one cold 800-gram batch, one 1-litre mould, and the steady heat of an oven bain-marie. We change the quantity and the heat source, not the method. One cook, one stove, one evening.

The reward comes to the table whole, pale rose-beige and lightly glossy with butter, then opens under the knife into four generous slices. Before the pan of water is filled, remember the deciding step: keep the mousseline cold until the mould is packed.