To show his gratitude, he mixed flour and water, spread it thinly over a hot Chinese gong and used the round baked cake to wrap bean paste and this was the origin of Dorayaki.
そのお礼に小麦粉を水で溶いて薄く伸ばしたものを熱した銅鑼に引き、丸く焼いた生地であんこを包み、振舞ったことが起源。