A cheeseburger is a hamburger topped with cheese. A hamburger topped with cheese is called a cheeseburger. Pasty varieties include chicken, venison, pork, hamburger, and pizza. A steak burger is marketing term for a hamburger claimed to be of superior quality. At the most they may grill a hamburger or a steak. Roujiamo is considered the Chinese equivalent to the Western hamburger and meat sandwiches. As with the invention of the hamburger, the exact origins of the cheeseburger are unknown. Kroc also rejected cost-cutting measures like using soybean filler in the hamburger patties. Sesame seeds are sometimes added to breads, including bagels and the tops of hamburger buns. Founded in 1926, their specialty is a loose meat hamburger. Clamshell grills, which cooked both sides of a hamburger simultaneously, were tested. Stop in the night for the greasy hamburger. Horton had an initial venture in hamburger restaurants. This is a list of notable hamburger restaurants. It is often called a "chinese hamburger" by locals.