Fatburger, Vera's, Burgerville, Back Yard Burgers, Lick's Homeburger, Roy Rogers, Smashburger, 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 patties" to distinguish them from inexpensive hamburgers made with cost-savers like added flour, textured vegetable protein, ammonia treated defatted beef trimmings (which the company Beef Products Inc, calls "lean finely textured beef"), advanced meat recovery, or other fillers. In the 1930s, ground liver was sometimes added. Some cooks prepare their patties with binders like eggs or breadcrumbs. Seasonings may include salt and pepper and others like parsley, onions, soy sauce, Thousand Island dressing, onion soup mix, or Worcestershire sauce. Many name-brand seasoned salt products are also used. Safety Raw hamburger may contain harmful bacteria that can produce food-borne illnesses such as Escherichia coli O157:H7, 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. Variations Other meats 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 burger uses ground venison from deer. Veggie burgers Vegetarian and vegan burgers can be formed from a meat analogue, a meat substitute such as tofu, TVP, seitan (wheat gluten), quorn, beans, grains or an assortment of vegetables, ground up and mashed into patties. Vegetable patties have existed in various Eurasian cuisines for millennia and are a commonplace item in Indian cuisine. Steak burgers A steak burger is a marketing term for a hamburger claimed to be of superior quality, except in Australia, where it is