According to legend, in 2 18 BC, Sean stabbed Qin Shihuang to death. When Niqiao escaped from Pizhou, Huang Shigong gave him a "heavenly book". Seeing that Zhang was yellow and thin, the squire let him eat raw moss. After eating, Sean's face was radiant and red, and he became a white-faced scholar. After Sean became a military adviser in the Western Han Dynasty, he still remembered the delicious dried moss, so he ordered the local officials to dedicate the dried moss, a specialty of Pizhou, to Liu Bang, the Emperor Gaozu. Liu Bang liked it very much after eating it and named it "Gongcai".
In Yang Guo, Anhui, there is also a story about dried moss. According to records, Yang Guo is the hometown of Laozi. There was a plague there more than two thousand years ago. At that time, people fled everywhere to avoid disaster. However, people near Tianjing Palace, where Laozi lives, found a kind of grass growing in the palace, which is actually healthy for people and animals. Therefore, the people call it "Shencao" and think it is an epiphany of Laozi to protect the people. People call this "sacred grass" "dry moss". Another legend is that in Tianjing Palace, some plants called Tianjing grass by local people grow, which is said to have hemostatic effect. The legendary Laozi was born under his fucking armpit, and his hair and beard turned white as soon as he landed. His mother saw that Lao Tzu, whose hair and beard were white, was hit hard and became weak. I treated her with Tianjingcao, and the effect was wonderful. Courtyard grass is a local specialty dry moss.
On the other hand, it is said that during the Qianlong period of the Qing Dynasty, moss entered the palace as a tribute, so it was called "tribute dish". Moreover, Emperor Qianlong visited Jiangnan six times and always tasted the dishes made of tributes.