Abstract: The invention relates to a cutter assembly for use in a meat grinder which consists of a disc perforated by bores of diameters which vary over the length of the bores thereby to provide dwell and massage zones and a rotatable knife in sliding engagement with one of the surfaces of the disc, the knife consisting of a peripheral ring and a hub with a plurality of evenly spaced first knife blades extending from the ring toward the hub, a plurality of evenly spaced second knife blades extending from the hub toward the ring, and a plurality of evenly spaced third knife blades extending from the hub to the ring, the knife blades forming between them cutting zones. The configuration of the perforations and the knife blades ensures cutting raw materials into particles of uniform size.