The origin of corn is America, and Mexico is the place where the origin and variety diversity of corn are concentrated. According to the Mayan holy book, corn was the main food of Incas, Mayans and Aztecs as early as 5000 years ago. It was introduced to China in the 16th century. By the end of the Ming Dynasty, corn was planted in Zhejiang, Fujian, Yunnan, Guangdong, Guangxi, Guizhou, Sichuan, Shaanxi, Gansu, Shandong, Henan, Hebei and other places.

Pepper was introduced to China from America in the late Ming Dynasty, but it was only used as an ornamental crop and medicinal material at first, and soon entered the menu of China. After pepper entered China, it was given the names of sweet pepper, ground pepper, spotted pepper, dog pepper, money pepper, spicy slice, sea pepper, pepper pepper, eggplant pepper, spicy horn, pepper and Qin pepper.

Now the latest research shows that pepper may first be introduced to Jiangsu, Zhejiang, Guangdong, Guangxi, Guizhou, Hunan and other places, and then spread to the southwest and other regions.