Diacetyl Tartrate ester of Monoglyceride, better know as DATEM, is an emulsifier used to make baked products rise to greater heights. DATEM is a blend of many different emulsifying agents. While most of these agents are of vegetable origin, some can be derived from animal sources. Unfortunately, it is impossible to know which is which in any giving product. Many vegetarian and vegan groups recommend their members avoid DATEM.