"Li Ji - Nei Zi" in the proposed: "Where food Qi see spring time, drink Qi see summer time, sauce Qi see fall time, drink Qi see winter time. Where and, spring more acid, summer more bitter, more pungent in the fall, more salty in the winter, adjusted to slippery sweet." The meaning of this passage is that: the food should be prepared according to the climate of the four seasons, the rice should be warm, the soup should be hot, the sauce should be cool, and the drink should be cold. The flavor of the preparation should also follow the rhythm: more sour in spring, more bitter in summer, more pungent in autumn, more salty in winter, and to be smooth and sweet seasoning to blend.