A food processing appliance having: a drive shaft coupled to a motor; a bowl having a hollow sleeve that extends upwardly from its bottom; a lid for closing the bowl; and a processing tool that includes a hub having an opening that extends from its lower end, and arranged to be fitted over the sleeve. The tool has a drive element coupleable to the drive shaft to be rotated by the motor. The lid is constructed to be placed on the bowl in a manner that leads to a reduction in the volume enclosed between the bowl and the lid while maintaining a degree of fluid tightness. The hub is provided with a vent and encloses a passage that is distinct from the lower drive element and that extends between the vent and the opening to allow escape of air from the volume to a region outside of the bowl.