Legend has it that during the construction of the Qianling Mausoleum, soldiers and craftsmen ground soybeans into soy milk, boiled it and drank it. Later, someone accidentally dropped gypsum into the soy milk, and the soy milk solidified. Some people dared to taste it. It was very good. eat. After that, he deliberately added an appropriate amount of gypsum to the prepared soy milk to let it solidify, and a new food was born. Because its shape resembles the brain, it was named tofu nao. It has been passed down to this day. Due to the special water quality of Qianxian tofu brain, it is white in color, soft and smooth, and does not fall apart when turned over and stirred continuously. In addition, we pay attention to the seasonings. The vinegar is boiled with incense and cinnamon, and the spicy noodles are diluted with vegetable oil.