A container for heating and cooking food includes: a lower containment body; an upper cover hermetically coupling with the lower containment body; and an automatic valve, in the shape of a cap, integrated in the upper cover, allowing steam to vent. The automatic venting valve includes: a control member controlling the pressure inside the container; and an elastic tongue associated and moulded in one piece with the control member. The control member is housed and rotatable in a recess in the upper cover. The elastic tongue has a deformed configuration, applying an elastic force pressing and closing the control member against a through hole in the bottom of the recess housing the control member, preventing the steam from exiting the container. When the steam pressure reaches a critical value, the control member rotates and tilts, removing the control member from the through hole, allowing the steam to vent.