Xuzhou, called Pengcheng in ancient times, is the land of Peng Zu. Kui Keng was named Peng Zu because he was sealed in Pengcheng. According to historical records, Peng Zu was the founder of Da Peng State and a great sage in ancient China, with a life span of 800 years. He is recognized as the originator of modern cooking in China and keeping in good health in China. According to legend, Peng Zu's youngest son, Xi Dingxi, fished 4,300 years ago, but Peng Zu was determined not to let him drown. One day, Ding caught a fish for fear of his father's reproach. Mother Yang hid the fish in the mutton pot that was being cooked. Peng Zu tasted the mutton and found it particularly delicious. After he found out the reason, he did the same thing, and let the "sheep hide fish", the "first dish in the world", spread to this day, which is also considered "fresh".