Hamburger such as , due to the occasional initial improper preparation of the meat, so caution is needed during handling and cooking. Because of the potential for food-borne illness, the USDA recommends hamburgers be cooked to an internal temperature of . If cooked to this temperature, they are considered well-done. Burgers can also be made with patties made from ingredients other than beef. For example, a "turkey burger" uses ground turkey meat, a "chicken burger" uses ground chicken meat. A "buffalo burger" uses ground meat from a bison, and an "ostrich burger" is made from ground seasoned ostrich meat. A deer
Hamburger such as lamb and pork may also be used. The meat is ground or chopped. In Australia, a steak burger is a steak sandwich which contains a whole steak, not ground meat. Steak burgers may be cooked to various degrees of doneness. Steak burgers may be served with standard hamburger toppings such as lettuce, onion, and tomato. Some may have additional various toppings such as cheese, bacon, fried egg, mushrooms, additional meats, and others. Various fast food outlets and restaurants such as Burger King, Carl's Jr., Hardee's, IHOP, Steak 'n Shake, Mr. Steak, and Freddy's market steak burgers. Some restaurants