Self-driving route: Chengdu refers to the unique tofu produced by Jianmen Pass in Jianmen Shudao Scenic Area. Legend has it that Jianmen Tofu began in the Three Kingdoms period, and Jiang Wei, a general of Shu Han, was summoned by the general of Wei in Hanzhong. After Wargo's defeat, he retreated to the dangerous sword gate. At that time, Jiang's soldiers were too tired to fight, and the horses were too tired to ride. Seeing that the sword gate of the barrier in northern Sichuan is in danger. A local official in Jianmen hurriedly gave Jiang Wei a plan: staying indoors for three days, there will be no war. Today, people grind soybean milk at home, reward soldiers with tofu, and feed horses with each other's dregs, and then fight again when soldiers and horses regain their strength. This plan is really clever.