A utensil for cooking food under pressure including at least: - a vessel and a lid that is designed to be mounted on said vessel to define a sealed cooking enclosure; - at least one locking member mounted to move on the lid between a locking position in which the lid is locked on the vessel and an unlocking position in which the lid can be taken off the vessel, said at least one locking member being mounted on the lid in such a manner as to be urged by positioning resilient return means towards its locking position so that the locking position corresponds to a rest position of the locking member, - a control device for controlling the movement of said at least one locking member, which control device includes an operating member suitable for being actuated by a user in such a manner as to cause said at least one locking member to move, said operating member being mounted in such a manner as to able to be moved and being mounted to be drivingly linked to said at least one locking member, - at least one locking valve mounted on the lid and suitable, under the effect of the pressure prevailing inside the utensil, for taking up a sealing high position and a leakage low position, said utensil being characterized in that: - the operating member is mounted to be drivingly linked to said at least one locking member in a manner such that the operating member takes up a stable rest position corresponding to said locking position and that action by the user on the operating member against action from the resilient return means causes the locking member to move towards its unlocking position, which position is unstable; - said locking valve is mounted so that, when said at least one locking member is in the locking position, it is free to take up its high position, thereby locking said at least one locking member in its locking position. - a vessel and a lid that is designed to be mounted on said vessel to define a sealed cooking enclosure; - at least one locking member mounted to move on the lid between a locking position in which the lid is locked on the vessel and an unlocking position in which the lid can be taken off the vessel, said at least one locking member being mounted on the lid in such a manner as to be urged by positioning resilient return means towards its locking position so that the locking position corresponds to a rest position of the locking member, - a control device for controlling the movement of said at least one locking member, which control device includes an operating member suitable for being actuated by a user in such a manner as to cause said at least one locking member to move, said operating member being mounted in such a manner as to able to be moved and being mounted to be drivingly linked to said at least one locking member, - at least one locking valve mounted on the lid and suitable, under the effect of the pressure prevailing inside the utensil, for taking up a sealing high position and a leakage low position, said utensil being characterized in that: - the operating member is mounted to be drivingly linked to said at least one locking member in a manner such that the operating member takes up a stable rest position corresponding to said locking position and that action by the user on the operating member against action from the resilient return means causes the locking member to move towards its unlocking position, which position is unstable; - said locking valve is mounted so that, when said at least one locking member is in the locking position, it is free to take up its high position, thereby locking said at least one locking member in its locking position. - the operating member is mounted to be drivingly linked to said at least one locking member in a manner such that the operating member takes up a stable rest position corresponding to said locking position and that action by the user on the operating member against action from the resilient return means causes the locking member to move towards its unlocking position, which position is unstable; - said locking valve is mounted so that, when said at least one locking member is in the locking position, it is free to take up its high position, thereby locking said at least one locking member in its locking position.