Speaking of this story, you may not believe that Zheng Chenggong, a famous national hero, discovered it. The reason is to improve the soldier's daily diet. When he saw children throwing lard and flour into an oil pan as mud, he sent out a smell. Zheng Chenggong picked up the whole dough and found that the dough was layered and very soft, so he was very happy to add a kind of food for the soldiers Delicious food finally became a famous snack in Taiwan.