The invention relates to a system for forming all variants of hamburger steaks (10), without being dedicated to a single variant, from a mass of meat (V), comprising a mold (12) including at least one cavity (140) for forming hamburger steak and a channel (3) for supplying the meat mass to the mold, and an element (20) for forming an interface between the supply channel and the mold. Said interface element includes: a pipe length (24, 25) having a first end (241) connected to an outlet of the supply channel and an opposite second end (201) connected to an inlet of the mold, a grinding plate (28, 48), and means (242, 251) for holding the grinding plate in a cross section of the pipe length, the holding means being discretely distributed along the pipe length.