A rice burger or riceburger is a variation on the traditional hamburger with compressed rice cakes substituted for the hamburger buns. The MOS Burger fast-food restaurant chain introduced the rice burger in 1987, and it has become a popular food item in East Asia. Beginning around 2005 McDonald's also offered a rice burger in some of its Asian stores, with mixed results.Popular in South Korea, Korean style rice burgers have kimchi and tuna.