Abstract: This present invention concerns a receptacle (1) made from a material that allows the passage of microwaves and that is intended to accommodate a food preparation (5) which has to undergo a final stage of steam cooking in a microwave oven, where this receptacle (1) includes a peripheral wall (2) and a bottom forming an internal volume, characterised in that the bottom of the receptacle is unperforated and includes a cavity which is (6) intended to accommodate a liquid reserve, and in that the peripheral wall (2) of the receptacle (1) is equipped with a series of channels for the diffusion (9) of steam generated from the liquid during the cooking stage in a microwave oven, with the said diffusion channels (9) being connected to the cavity (6) and to the internal volume of the receptacle (1).