A food processing appliance includes a bowl to contain the food, with a side wall, a rotary work accessory arranged in the bowl, a lid arranged on the bowl, the lid including a manually operated motor to cause a drive shaft to spin the work accessory around a rotation axis A by pulling on a cord transversely to the axis A. The lid includes: a first dynamic gasket arranged between the lid and the side wall to fill the space therebetween; a second dynamic gasket, arranged between the lid and the drive shaft to fill the space therebetween; each gasket having an inner wall, a connecting part arranged on the lid, an annular lip and a groove; the lip movable and deformable with a displacement angle α extending outwards relative to the axis A, so as to ensure a watertight seal when the lid is connected to the bowl.