Noodles originated from Pingliang, the birthplace of ancient Huang San, and started from Guangchengzi 4700 years ago, which is closely related to the Taoist way of keeping in good health. Pingliang and Tianshui in eastern Gansu are the birthplaces of ancient Huang San, as well as Nu Wa and Kuafu, with a long history of culture. Xuanyuan, the Yellow Emperor, who was revered by the Chinese nation as the ancestor of mankind, traveled to the border of the western regions after making meritorious deeds, climbed the Kongtong Mountain in person, and asked Guang, who lived in seclusion in Kongtong Mountain, for the way of governing the country and the art of keeping in good health, which was recorded in detail in Zhuangzi Zai You, and Sima Qian, who was rigorous in his studies, also wrote A Record of Five Emperors.

According to orthodox Taoism, Guang Chengzi is the embodiment of the old gentleman in the Yellow Emperor era and the first of the twelve golden immortals. "Tai Shang Lao Jun Kai Jing": "When the Yellow Emperor, Lao Jun was a teacher and posthumous title Guang." Legend of the Immortal is widely known as Xuanyuan people, who lived in the stone room of Kongtong Mountain (now Pingliang City, Gansu Province). The Yellow Emperor heard his name for a long time and came to visit to discuss the way of governing the country and keeping in good health. Huang Di asked Guang: "You have reached the peak in studying the way of everything in the world. Can you please teach me the true meaning of this? " At that time, Guangtouzi taught Huangdi a volume of natural classics. Huangdi was invited to have dinner together. With a wave of his sword of light, he cut down a stout peach tree, hollowed out the straightest section in the middle of the trunk, and drilled many small holes with a brass knife, which were as big as thick hemp thread. Then put the peach wood on the hearth pottery, put the dough into strips with a mallet, and drop it into a boiling water pot to cook.

Dough is made of wild buckwheat growing near Kongtong Mountain, which is sweet and cold. Modern medical research shows that it is rich in vitamin E and soluble dietary fiber, and also contains nicotinic acid and rutin, which has the functions of lowering blood lipid and cholesterol, softening blood vessels, protecting eyesight and preventing cerebrovascular diseases. In addition, it also has the effects of invigorating spleen, invigorating qi, stimulating appetite, moistening intestines, relaxing bowels, resolving food stagnation, eliminating dampness and lowering qi, and treating intestinal dysentery, gastrointestinal stagnation and chronic diarrhea.

In ancient times, people did not invent noodles, but simply called the dough made of grain flour and water "cakes". As a result, this bowl of buckwheat "cake" made widely became the earliest noodle in China.

Huangdi, who is used to eating delicacies, big fish, big meat and whole grains, felt warm and refreshed after eating this bowl of "soup cake". Immediately, I asked Guang about "the Taoist way of keeping in good health, the principle that the five elements coexist and resist each other", and the secret of how Guang cultivates self-cultivation and lives forever, "1,200 years old but not old" and so on. In the face of the sincere Yellow Emperor, just call a spade a spade: wood makes a fire, fire makes soil, soil makes gold, gold makes water, aquatic wood. Buckwheat belongs to the five elements of wood, and the queen mother who returned to Zhongshan in Jingchuan often eats it. Therefore, it is suggested that Huangdi eat it regularly to "harmonize the five elements, activate the collaterals", which is of great benefit to prolong life. Huangdi praised its unique flavor and remembered every word of advice. He only felt a bright heart, eyes suddenly enlightened. He praised: "Jin Xian Longzhong gave buckwheat the ability to activate its activities, and Ji got a way to govern herself." Say goodbye again.

After the Yellow Emperor returned to the palace, he quietly cultivated himself according to the methods widely taught him. Summarize what you have learned into a medical skill-Neijing. And let the chef imitate the practice of Gong Guang during the Cultural Revolution, and often make buckwheat noodles to eat. Word-making Minister Cang Xie also translated the word "Huoluo" into "Lehe". According to legend, Lapras ascended to heaven at the age of 120. Guangchengzi is the first of the twelve golden immortals, under the door of Yuxiu Palace. Therefore, in the folklore of Longdong, there is also an allusion that "Jin Xian traveled in Longdong by crane and Xuanyuan went to Lapras".

Since then, the production method of Lehe cuisine has gradually spread among the people, and then spread to northern areas, namely Gansu, Shaanxi, Inner Mongolia, Qinghai, Shaanxi, Hebei, Henan and other places. After nearly 5000 years of inheritance and development, noodles have gradually evolved from the original wild buckwheat production to today's wheat flour or corn flour and other miscellaneous grains production. Pork, beef, mutton, tomatoes and eggs are added, which makes the taste better and the auxiliary materials more abundant. On the basis of the original materials, more than ten kinds of traditional Chinese medicines for invigorating qi are added as seasoning, which has the effect of health care. The book "China Flavor Diet" refers to noodles as "strengthening the spleen and stomach, and preserving health as treasure".