Okra, also known as croissant, coffee Huang Kui and Solanum nigrum, is native to Africa, and there are also wild varieties in China. At present, it is widely cultivated in tropical areas such as Europe, Africa, Middle East, India and Southeast Asia. Okra has become a high-grade nutritional and health-care vegetable sought after by people, which is popular all over the world. Its edible part is pod, which is divided into green and red. Crisp, tender and juicy, smooth but not greasy, with unique fragrance, it is favored by the people.