Xiaoman has a bitter dish in solar terms, Zhou Shu: a bitter dish show on Xiaoman's day. As the saying goes, spring breeze blows, bitter vegetables grow long, and wasteland is a granary. Bitter vegetables are one of the earliest edible wild vegetables in China. The Book of Songs: Take pains, under the sun. It is said that Wang Baochuan ate bitter vegetables in the cold kiln for 18 years in order to survive.

Sophora alopecuroides is spread all over the country. In medicine, it is called Patrinia herb, which is called "Sophora alopecuroides" by Ningxia people, "Sophora alopecuroides" by Shaanxi people and "Tianxiang herb" by Li Shizhen. Mr Nie Fengqiao, a famous gourmet in China, discovered a bitter herb with yellow flowers in Ningxia in 1958, which is called "sweet bitter herb". Its leaves are big, its stems are crisp, and its bitterness is sweet. Compared with the common bitter herbs with blue flowers, it has many advantages.

Bitter bitter herbs, with astringency in bitterness and sweetness in astringency, are fresh and refreshing, cool and tender, and rich in nutrition. They contain many vitamins, minerals, choline, sugar, riboflavin and mannitol needed by human body, and have the functions of clearing heat, cooling blood and detoxifying. Compendium of Materia Medica: (Bitter vegetables) Take it for a long time, feel at ease and benefit qi, intellectual fit and be resistant to old age.