What are the main aspects of the communication between Song and Song in the third stage of Sichuan cuisine history?

Sichuan cuisine originated from Bashu in ancient China. Its development has gone through four stages: from the Spring and Autumn Period to the embryonic stage of the Jin Dynasty, from the Sui and Tang Dynasties to the Five Dynasties, from the Song Dynasty to Sichuan and spread to other places, and to the formation of cuisines in the late Qing Dynasty and the early Republic of China. Since then, from the Revolution of 1911 to War of Resistance against Japanese Aggression, China's cooking has been a mixture of different factions, which has deeply influenced the cooking of Sichuan cuisine and enriched it. After the founding of People's Republic of China (PRC), the production party and people's government of China attached great importance to cooking, and the status of chefs improved, and talents came forth in large numbers, which opened up an infinitely broad prospect for the further development of Sichuan cuisine.

Ancient Sichuan cuisine was still very prosperous until the Tang and Song Dynasties, leaving a deep impression on many foreigners. Du Fu once said: "The wine in Shu is invincible, and the fish in the river is beautiful." Lu You has been an official in Sichuan for a long time and was deeply impressed by the local food. After leaving Sichuan, he never forgot: "I have been here for seven summers, and I have never forgotten my comfort." There are more than 50 poems about Sichuan cuisine in the "Poems of Jiannan".

The formation of ancient Sichuan cuisine benefited from the relatively stable economic and political situation in Sichuan, but it was also destroyed by the war. Especially in the Song Dynasty, Mongolia bypassed the southwest and destroyed the Northern Song Dynasty. Sichuan was severely affected and its population dropped sharply. At the end of the Ming Dynasty, under the brutal rule of Zhang, the population reached an all-time low. Sichuan officials mentioned in the memorial to the emperor in the early Qing Dynasty that "the universe is vast, such as the beginning of heaven and earth". Sichuan food is dying, too