The MOS Rice Burger uses a bun made of rice mixed with barley and millet.
Rice was first used as a bun in 1987, when the restaurant served the Tsukune Rice Burger, filled with ground chicken and daikon, and seasoned with soy sauce.

The MOS Rice Burger has been imitated by the Taiwanese division of McDonald's, where the rice bun was pan-seared, but it remains a MOS-exclusive item in Japan and other markets.
The MOS Rice Burger uses a bun made of rice mixed with barley and millet. Rice was first used as a bun in 1987, when the restaurant served the Tsukune Rice Burger, filled with ground chicken and daikon, and seasoned with soy sauce.
The MOS Rice Burger has been imitated by the Taiwanese division of McDonald's, where the rice bun was pan-seared, but it remains a MOS-exclusive item in Japan and other markets.
MOS Burger