Wiktionary
n. A Japanese confection consisting of two sponge cake patty wrapped around a filling of sweet azuki bean paste.
Wikipedia
is a type of Japanese confection, а red-bean pancake which consists of two small pancake-like patties made from castella wrapped around a filling of sweet Azuki red bean paste. Dorayaki are similar to Imagawayaki, but the latter are cooked with the batter completely surrounding the bean paste filling and are often served hot.
The original Dorayaki consisted of only one layer. Its current shape was invented in 1914 by Usagiya in the Ueno district of Tokyo.
In Japanese, dora means " gong", and because of the similarity of the shapes, this is probably the origin of the name of the sweet. Legend has it that the first Dorayaki were made when a samurai named Benkei forgot his gong (dora) upon leaving a farmer’s home where he was hiding and the farmer subsequently used the gong to fry the pancakes, thus the name Dorayaki.