The sour plum sauce is concentrated according to the ratio of 1 to 10, that is, 1 serving of sour plum sauce is added with 10 serving of water, soaked in warm water, cooled and put in the refrigerator for refrigeration, and the taste is better. Sour plum soup is made of hawthorn, dark plum, white sugar and other raw materials, and is rich in active substances such as fruit acid and flavonoids. The taste of sour plum soup is mainly determined by the content of hawthorn and dark plum.

Hawthorn: it is the mature fruit of deciduous shrubs or small arbor plants in Rosaceae, also known as red fruit and hawthorn. It is not only a traditional Chinese medicine, but also a fruit, which can be eaten raw or cooked. It is regarded as a good food for health and diet in ancient and modern times. Hawthorn tastes sour, sweet and slightly warm. "Compendium of Materia Medica" says: Hawthorn diet can eliminate accumulated meat, eliminate phlegm, reduce swelling and swallow acid, and promote blood circulation to reduce swelling.

Plum: There are four kinds of plums: Prunus mume, Bai Mei, Hongmei and Huangmei. There are many kinds of products, all of which are smoked and called ebony. Mume is edible, followed by Bai Mei. Prunus mume is the immature fruit of Prunus mume in Rosaceae. Contains citric acid, malic acid, succinic acid, sugar, sitosterol, vitamin C and other ingredients, and has ideal antibacterial effect. Mume is a homologous product of medicine and food, and it is one of the processed Chinese herbal medicines of Mume. It is mild in nature and sour in taste.