The actual “filtering” consists of drying the raw material by evaporation in the cooker (item 6) which has been specifically designed to allow for this. The mix is heated by circulating steam in the gap between the lining and the outside of the autoclave. A rotary shaft inside the autoclave has specially shaped and positioned heated rotors that heat the material during the cooking process and then are used to empty the product when this stage of the process has been completed. The dried product is sent to the filter box (item 7) which has a mesh to allow for the initial separation of fat and cracklings. Any moisture in the raw material that evaporates in the autoclave is sent to the steam condensation system (item 24).