Tsukiji Donburi Ichiba is a donburi shop in Tsukiji Market that serves seafood rice bowls topped with tuna and sea urchin. The tuna belly steak donburi is salty with a slight sour note at the end, and the fish is cooked through. The tuna donburi has a balanced vinegar taste in the rice and comes in a large portion. The sea urchin has a bitter taste and a sewage smell.