The invention relates to an appliance for cooking food under pressure, the appliance comprising: a bowl and a lid; locking/unlocking means suitable for going between a locking position in which the lid (2) is locked relative to the bowl and an unlocking position; and decompression means (6) for decompressing the vessel; wherein said locking/unlocking means and said decompression means (6) are connected functionally to a single, common control member (7A), said control member (7A) being designed to be suitable for finding itself in a locking and decompression position in which the locking/unlocking means find themselves in their locking position, while the decompression means are activated. The invention is applicable to household appliances for cooking under pressure.