What is Tallow and Its Origins? Tallow is a type of animal fat, typically rendered from beef or mutton, which has been used in cooking and food preservation for hundreds of years. The rendering process involves cooking the fat slowly to separate it from connective tissues and impurities, resulting in a smooth, creamy substance. In the past, tallow was a kitchen staple, especially before the widespread use of vegetable oils. Its long shelf life and ability to handle high heat