A 500-word essay about Pizhou Taigan

According to legend, in 218 BC, Zhang Liang failed to assassinate the First Emperor of Qin and fled to Pizhou. When he met Huang Shigong to teach him the "Book of Heaven" at the Guanqiao Bridge, Taigong Zhenren saw that Zhang Liang's skin was yellow and his face was thin, so he asked him to eat raw moss and dried moss. Zhang Liang's face was radiant and rosy after eating, and he became a white-faced scholar. After Zhang Liang became a military advisor in the Western Han Dynasty, he still did not forget the delicious taste of dried moss, so he ordered the local officials to bring dried moss, a specialty of Pizhou, to Liu Bang, the great ancestor of the Han Dynasty, for tasting. Liu Bang liked it very much after eating it and named it "tribute dish".