According to legend, when Emperor Qianlong traveled incognito the West Lake, he came to Wu Shan, which coincided with a thunderstorm. They had no choice but to go directly to a small restaurant to take shelter from the rain. They are hungry, cold and very embarrassed. When the shopkeeper Wang Xiaoer saw this, he cooked a pot of silver carp head, tofu and other food left in the shop, and served it to Gan Long and others. They all ate well, and they all praised the delicious food. When Qianlong returned to his hometown, he never forgot it. He revisited his hometown, tasted this dish again, and named it "Imperial Rice". Everyone knows that the emperor appreciates its taste very much. With the busybodies running around telling each other, officials and people rushed to come, and the business was very prosperous. Since then, Wang Xiaoer has monopolized the casserole, fish head and tofu, and has become a famous dish in Hangzhou with the same reputation as Dongpo meat.