Oyaki (おやき) is a Japanese dumpling made from a fermented buckwheat dough wrapped around a stuffing of Japanese vegetables, fruit, or anko bean paste and then roasted on an iron pan. The resulting bun is then either steamed or broiled and eaten hot. Oyaki are popular and widely available in Nagano Prefecture which is famous for the dish.

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Oyaki

Type	Dumpling
Region or state	Nagano Prefecture
Associated cuisine	Japan
Serving temperature	Hot
Main ingredients	Fermented buckwheat dough
Ingredients generally used	Vegetables, fruit, or anko bean paste
Media: Oyaki

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Nagano's oyaki are not to be confused with Imagawayaki which is made from a light batter and is eaten as a dessert, though you can find many stores selling Imagawayaki as Oyaki.

Nagano Prefecture's steep mountains and cold climate made rice cultivation difficult and produced poor yields in pre-industrial Japan. Farmers in Nagano turned to buckwheat (soba) instead. The resulting flour was then mixed with water and stuffed with local wild vegetables and seasoned with soy sauce and salt.

• List of buckwheat dishes

• My Home Town and Local Food English language web page describing how oyaki are made at Oyaki Village in Ogawa Village, Nagano Prefecture.
• Oyaki Village website (in Japanese)