It's said that the origin of hand-held cakes mentioned this story, which may not be believed to be discovered by Zheng Chenggong, a famous national hero. The reason is to improve soldiers' daily diet. When children throw lard and flour into an oil pan as mud, they send out a smell. Zheng Chenggong picks up the whole dough, and finds that the dough is layered and very soft, so he is very happy