MOS Burger is the Japanese burger chain known for a rice burger that uses grilled rice cakes instead of a bread bun.
MOS Burger introduced the rice burger in Japan in 1987. Its bun-like pieces are compact grilled rice cakes, creating a sandwich format that combines a hamburger-chain meal with familiar Japanese ingredients and textures. Variations have included fillings such as grilled meat, seafood, and vegetables.
The rice burger helped MOS Burger distinguish itself from American-style competitors in Japan. It is not simply a burger served with rice on the side: the rice cakes replace the bread and hold the filling together. The chain’s name comes from “Mountain, Ocean, Sun,” reflecting its stated connection with nature.