original question: what Dietary restriction is Incompatible with an Ingredient that's Typically used in dishes [Hamburger]?
answer: veganism, vegetarian food
answer type: Dietary restriction.
auxiliary information: A hamburger is a sandwich consisting of one or more cooked patties of ground meat, usually beef, placed inside a sliced bun. Hamburgers may be cooked in a variety of ways, including pan-frying, barbecuing, and flame-broiling. Hamburgers are often served with lettuce, bacon, tomato, onion, pickles, cheese and condiments such as mustard, mayonnaise, ketchup, relish, and green chile. The term "burger" can also be applied to the meat patty on its own, especially in the UK where the term "patty" is rarely used. The term may be prefixed with the type of meat or meat substitute used, as in "turkey burger", "bison burger" or "veggie burger". Hamburgers are sold at fast food restaurants, diners, specialty burger restaurants and even high-end restaurants. There are many international and regional variations of the hamburger.
What dietary restriction prevents consumption of an ingredient typically used in things such as a [Hamburger]?