A method, device, and knife system for producing purëed, cooked foodstuffs from piece-form raw material. The method includes pre-chopping of the piece-form raw material in a pre-chopping unit, cooking of the pre-chopped raw material in a cooking plant, and final processing of the cooked product in a final-processing unit. Before cooking, the piece-form raw material is cut into small pieces by the pre-chopping unit such that a pumpable mass is produced from the piece-form raw material.