A foo mill is a tool used to grind and purée foods through perforated disks using a hand-turned crank. Functionally, it can be described as a mechanical sieve. The user fits one of three sieving discs (coarse, medium, or fine) into the open base of the bowl-shaped hopper. The food is forced through the sieve by a spring-loaded, semi-circular blade of tinned or stainless steel, which is clipped in place to press down hard on the sieve. This disc revolves on the surface of the sieve as the central crank is rotated. Three corrugated feet on the base keep the mill securely in position on top of a pan.