G20 summit national banquet dishes. The background originated from the Southern Song Dynasty, when people brewed crabs, oranges, ginger, yellow wine and other raw materials. The theory of seven emotions compatibility is skillfully applied, including mutual need, mutual absorption, mutual killing and mutual fear in the theory of seven emotions compatibility.

The ancients believed that crabs were non-toxic and cold. Some places steam crabs with perilla. But perilla, after all, has medicinal taste, which may affect the taste of crab itself. After exploration, it is found that oranges can detoxify and make crabs taste better. Orange peel has the functions of promoting digestion, regulating qi and stopping vomiting. Li Shizhen recorded in Compendium of Materia Medica that orange peel "can dispel wind, cure gallbladder, send scrotum and kill fish and crab poison". Obviously, orange peel can kill crab roe. Therefore, the compatibility of oranges and crabs not only plays a role in taste, but also plays a role in medicine. Crabs are cold, such as ginger, yellow wine and oranges, which can be said to be warm.

A good crab-brewed orange should smell delicious, and the orange is refreshing, sweet and sour.