Powder mother-in-law potato powder: According to legend, Cao Zhi, the son of Cao Cao in the Three Kingdoms, was brilliant since childhood. Cao Cao loves him very much, so he is jealous of his brother xelloss. After Cao Cao's death, Cao Pi succeeded to the throne and wanted to kill his brother. So Cao Zhi was told to go to the temple and write a poem within seven steps, or he would be killed. Cao Zhi thought to himself, "Boiled beans and boiled bean soup, the beans crying in the pot are from the same root, so why fry each other!" Xelloss heard tears in his eyes. After banishing his younger brother, Cao Zhi was depressed, so he drank too much to write poems and played around. Once in Chang 'an, he ate a bowl of potato powder sold by an old woman along the street, which was delicious in color and flavor and pleasing to the eye. Sui Zhan's poem said: "The entrance is mellow and the aftertaste is long." Praise the delicious potato noodle soup. Subsequently, potato flour became famous, and business changed from ordinary streets to bustling streets. Up to now, it has become a famous dish in China with unique flavor.