Dorayaki
Dorayaki (どら焼き, どらやき, 銅鑼焼き, ドラ焼き) is a type of Japanese confection which consists of two small pancake-like patties made from kasutera wrapped around a filling of sweet red bean paste.
It originally only had one layer, and the current shape was invented in 1914 by the Ueno Usagiya.
In Japanese, dora means "gong", and this is probably the origin of the name of the sweet.
Dorayaki is Doraemon's favourite food.
Another name
In Kansai area, such as Osaka or Nara, this sweet is often called mikasa（三笠）. The word originally means triple straw hat, but also an alternative name of Mount Wakakusa, a low hill with gentle slope located in Nara. Many local people picture the shape of this hill while eating a mikasa. In Nara, a larger mikasa of about 30 cm in diameter is famous.