Unitola Nakadori is a restaurant in a narrow alley of the Tsukiji outer market that serves sea urchin rice bowls and seafood rice bowls. Its signature dish, Miyabi, puts five kinds of Japanese sea urchin on one bowl so you can compare their flavors. One account describes arriving at 6:40 a.m. and entering when the doors opened at 7. Food comes out quickly after ordering, and the amount of sea urchin covers only half the rice.