is a Japan

Japan

Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...

ese fish

Fish

Fish are a paraphyletic group of organisms that consist of all gill-bearing aquatic vertebrate animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish, as well as various extinct related groups...

-shaped cake

Cake

Cake is a form of bread or bread-like food. In its modern forms, it is typically a sweet and enriched baked dessert. In its oldest forms, cakes were normally fried breads or cheesecakes, and normally had a disk shape...

. The most common filling is red bean paste

Red bean paste

Red bean paste or Azuki bean paste is a sweet, dark red bean paste originating from China. It is used in Chinese cuisine, Japanese confectionery, and Korean cuisine. It is prepared by boiling and mashing azuki beans and then sweetening the paste with sugar or honey...

 that is made from sweetened azuki bean

Azuki bean

The is an annual vine, Vigna angularis, widely grown throughout East Asia and the Himalayas for its small bean. The cultivars most familiar in north-east Asia have a uniform red color, but white, black, gray and variously mottled varieties are also known. Scientists presume Vigna angularis var...

s. Other common fillings may be custard

Custard

Custard is a variety of culinary preparations based on a cooked mixture of milk or cream and egg yolk. Depending on how much egg or thickener is used, custard may vary in consistency from a thin pouring sauce , to a thick pastry cream used to fill éclairs. The most common custards are used as...

, chocolate

Chocolate

Chocolate is a raw or processed food produced from the seed of the tropical Theobroma cacao tree. Cacao has been cultivated for at least three millennia in Mexico, Central and South America. Its earliest documented use is around 1100 BC...

, or cheese

Cheese

Cheese is a generic term for a diverse group of milk-based food products. Cheese is produced throughout the world in wide-ranging flavors, textures, and forms....

. Some shops even sell taiyaki with okonomiyaki

Okonomiyaki

is a Japanese dish containing a variety of ingredients. The name is derived from the word okonomi, meaning "what you like" or "what you want", and yaki meaning "grilled" or "cooked" . Okonomiyaki is mainly associated with Kansai or Hiroshima areas of Japan, but is widely available throughout the...

, gyoza filling, or a sausage

Sausage

A sausage is a food usually made from ground meat , mixed with salt, herbs, and other spices, although vegetarian sausages are available. The word sausage is derived from Old French saussiche, from the Latin word salsus, meaning salted.Typically, a sausage is formed in a casing traditionally made...

 inside.

Taiyaki is made using regular pancake

Pancake

A pancake is a thin, flat, round cake prepared from a batter, and cooked on a hot griddle or frying pan. Most pancakes are quick breads; some use a yeast-raised or fermented batter. Most pancakes are cooked one side on a griddle and flipped partway through to cook the other side...

 or waffle

Waffle

A waffle is a batter- or dough-based cake cooked in a waffle iron patterned to give a distinctive and characteristic shape. There are many variations based on the type and shape of the iron and the recipe used....

 batter

Batter (cooking)

Batter is a semi-liquid mixture of one or more flours combined with liquids such as water, milk or eggs used to prepare various foods. Often a leavening agent such as baking powder is included to aerate and fluff up the batter as it cooks, or the mixture may be naturally fermented for this purpose...

. The batter is poured into a fish-shaped mold for each side. The filling is then put on one side and the mold is closed. It is then cooked on both sides until golden brown.

Taiyaki was first baked by a sweet shop Naniwaya in Azabu

Azabu

is an area within Minato in Tokyo, Japan, built on a marshy area of foothills south of central Tokyo. Its coverage roughly corresponds to that of the former Azabu Ward, presently consisting of nine official districts: Azabu-Jūban, Azabudai, Azabu-Nagasakachō, Azabu-Mamianachō, Nishi-Azabu,...

, Tokyo

Tokyo

, ; officially , is one of the 47 prefectures of Japan. Tokyo is the capital of Japan, the center of the Greater Tokyo Area, and the largest metropolitan area of Japan. It is the seat of the Japanese government and the Imperial Palace, and the home of the Japanese Imperial Family...

 in 1909, and now can be found all over Japan, especially at food courts of supermarkets and .

They are similar to , which are thick round cakes also filled with sweet azuki bean paste or custard.