A couple of days ago I ate this kind of cake, which is named after the shape of a fish (tai – sea bream). It is most commonly found on festivals or food courts.
The outside is made of regular pancake or waffle batter, and in the inside it may have many ingredients: custard, cheese, chocolate, red bean paste, and there are even okonomiyaki and gyoza fillings! The one I ate had custard filling, it was so good! ^-^