Commercial gelatin—a protein derived from animal connective tissue, commonly pig skin and beef bones, but also chicken and fish—is an important tool that helps us to achieve specific textures and consistencies in the sweet kitchen. It comes in two different forms, and even similar forms differ from brand to brand, so it’s important to know the qualities of each form of gelatin.
Gelatin comes in brittle translucent sheets, called leaf gelatin, and as powder. Powdered gelatin, especially the brands common in grocery stores, is derived from beef bones and adds an unpleasant bone flavor to food; powdered gelatin can also be a little more gluey on the palate. If you must use powdered gelatin, use a brand derived from pork products instead of beef.