Time Out says
Don't be fooled by the 'grilled tuna' advertised at this outer market shop – the dish is actually taiyaki, a fish-shaped dessert consisting of a pancake shell filled with red bean paste. It gets its name from its crispy shell and thick body, which is shaped a little like a tuna fish. You can also sample the 'medium-fatty tuna' dessert, made from apricots and more red bean paste. Find it near the Tsukiji Yon-chome street crossing.
4-11-9 Tsukiji, Chuo-ku
|Transport:||Tsukijishijo Station (Oedo line); Tsukiji Station (Hibiya line)|
|Opening hours:||8am-3pm (occasionally 2pm) / closed Sun, hols, some Weds|