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Rendering is a process that converts waste animal tissue into stable, value-added materials. Rendering can refer to any processing of animal products into more useful materials, or, more narrowly, to the rendering of whole animal fatty tissue into purified fats like lard or tallow.
The majority of tissue processed comes from slaughterhouses, but also includes restaurant grease and butcher shop trimmings and expired meat from grocery stores. The rendering process simultaneously cooks the material and separates the fat from the protein. A rendering process yields a fat commodity (yellow grease, choice white grease, bleach-able fancy tallow, etc.) and a protein meal called dry rendered tankage or meat and bone meal.