rice burger
A burger-style sandwich where the buns are made of compressed rice instead of bread. A Japanese fast-food creation.
I ate a rice burger for the first time at Mos Burger.
In a rice burger, rice takes the place of bread.
Wasei-eigo (Japanese-made English) from 'rice' + 'burger'. The concept originated in Japan, notably popularized by the fast-food chain Mos Burger in the 1980s.