Hamburger and Sonic also rely heavily on hamburger sales. Fuddruckers and Red Robin are hamburger chains that specialize in the mid-tier "restaurant-style" variety of hamburgers. Some restaurants offer elaborate hamburgers using expensive cuts of meat and various cheeses, toppings, and sauces. One example is the Bobby's Burger Palace chain founded by well-known chef and Food Network star Bobby Flay. Hamburgers are often served as a fast dinner, picnic or party food and are often cooked outdoors on barbecue grills. A high-quality hamburger patty is made entirely of ground (minced) beef and seasonings; these may be described as "all-beef hamburger" or "all-beef
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