En Papillote — Steam Parcel Cookery

En papillote (French: 'in parchment') is a method of cooking food sealed in a folded packet of parchment paper or aluminium foil, where the food cooks in its own steam and the steam generated from added liquids such as wine, stock, citrus juice, or aromatics. The technique is among the most elegant and practical in the kitchen — it concentrates flavours, preserves delicate textures, requires minimal fat, and creates a dramatic tableside presentation when the sealed packet is opened by the guest. The science is essentially gentle steam cooking in a sealed microenvironment. The parcel is placed in a hot oven (180–200°C) or briefly on a stovetop, and the liquid within the parcel — including the natural juices from the food — reaches boiling point and creates a steam atmosphere inside the sealed pocket. This steam cooks the food from all directions simultaneously at near-100°C, producing even, gentle heat distribution without drying or browning. For delicate fish fillets and shellfish, en papillote is ideal: the steam environment prevents the surface from drying, and the short cook time (10–18 minutes depending on thickness) preserves texture and moisture that would be lost in conventional roasting. Aromatics — shallots, fennel, citrus slices, fresh herbs, capers — placed alongside the fish infuse their volatile compounds into the steam that surrounds the fish. The sealing method is critical. Parchment is folded into a half-moon or rectangular envelope with overlapping pleats that trap steam. An imperfect seal causes steam loss and uneven cooking. Foil seals more easily and holds steam more reliably but sacrifices the visual drama of the parchment puff at the table. Silicone reusable pouches have become a modern alternative. The packet should puff visibly in the oven as steam accumulates — this is the indicator that cooking is proceeding correctly. At the table, the guest cuts or tears open the packet, releasing a fragrant cloud of steam — the theatrical culmination of the technique.