Every time Gan Long leaves the palace, he will come to Qianmen Street to taste the delicious food called "Old Duck Soup". One day, while enjoying delicious food, Gan Long felt that the name of this "old duck soup" lacked some connotations, so he ordered Xiao Shenyang and Ji Xiaolan to rename this "old duck soup". Small Shenyang said "the aftertaste is endless, the fragrance is mellow, and it is as moist as jade", and Ji Xiaolan said that "a thousand turns, the jade must be cut and the abrasive must be cut", so Gan Long personally mentioned every possible way. Since then, this rare species can not be eaten by the people, only the palace can enjoy it.