noun
sea urchin donburi; rice bowl with sea urchin
A donburi dish consisting of a bowl of rice topped with fresh sea urchin, often seasoned with soy sauce or wasabi.
北海道でウニ丼を食べた。
I ate sea urchin donburi in Hokkaido.
ウニ refers to the sea urchin itself, whereas ウニ丼 is the prepared dish.
Compound of ウニ (sea urchin) and 丼 (donburi, rice bowl dish).