Taiyaki is a Japanese fish-shaped cake made using pancake or waffle batter. The most common filling is red bean paste that is made from sweetened azuki beans. Other common fillings may be custard, chocolate, cheese, or sweet potato. Taiyaki is believed to have originated in Tokyo but now can be found all over Japan, at specialty shops, food courts, supermarkets and Japanese festivals.

https://en.wikipedia.org/wiki/Taiyaki