It comes from the Zhenjiang folk tale Qianlong and Huang Nucai.

It is said that during the Qing Dynasty, one autumn, Emperor Qianlong went to the countryside of Zhenjiang for a private visit. Because his money was stolen, he was unbearably hungry and thirsty. In addition, the autumn climate was dry and his nose was bleeding, so he went to a farmer's house to beg for food. The farmer fried some cakes and cooked a pot of soup for him.

Qianlong tasted the soup and found it very delicious. Soon, the nosebleeds stopped. He asked the farmer what kind of vegetable the soup was made from, and the old farmer smiled and said: "Green pulp and white jade version, red beak and green parrot." When Qianlong returned to the capital, he ordered his ministers to analyze these two folk songs. It turns out that in this green soup, there are pieces of tofu as white as jade, and spinach with green leaves and red roots.

Extended information:

Other food stories related to Qianlong:

Baixi Tofu:

During the Qianlong period, Emperor Qianlong visited the south In the south of the Yangtze River, we passed by Baixi River and stayed overnight in a small shop in the village. The shop owner is a great-great-grandson who learned to make tofu from an old woman. He didn't know that the customer was the emperor of the dynasty, so he only served water tofu. Qianlong tasted the food slowly, and the more he tasted it, the more tender it became, and he asked for "a few more plates." The owner gave three plates in a row. Qianlong was so unhappy that he stopped for nine nights.

Before leaving, he asked the shopkeeper to prepare pen and ink and inscribed "Walking through the world, Baixi has good tofu". The shop owner hung the plaque in the hall. One day, a Hanlin scholar was studying here. He was dumbfounded when he saw the plaque and asked the shopkeeper.

The shopkeeper told the story, and Hanlin said: "This is the emperor's imperial pen at that time." Everyone was puzzled as to why the emperor wrote "Baisha" as "Baixi". The shopkeeper recalled that Emperor Qianlong drank two more cups at that time. , mistakenly wrote Baisha as Baixi. Baixi spread from then on and has been called it to this day. Not long after Qianlong returned to the court, he announced Baixi Tofu as tribute.