Korean cold noodles are snacks in northeast China. It is famous at home and abroad for its unique flavor. The main raw materials are buckwheat flour, wheat flour and starch, as well as corn flour, sorghum rice flour and cowpea starch. Add beef soup or chicken soup, and then put some spices such as pepper, pepper, beef slices, eggs, apple slices and sesame oil on the noodles. Cold noodles are cool and fragrant, sweet and fresh. So Koreans like to eat cold noodles not only in hot summer, but also in cold winter. In addition to Yanbian Korean Autonomous Prefecture, there are Korean cold noodle shops in large and medium-sized cities such as Beijing, Shenyang, Harbin and Changchun. In the past, Koreans used to eat cold noodles at noon on the fourth day of the first month, or on their birthdays. According to folklore, eating slender cold noodles on this day will lead to longevity and great happiness, so cold noodles are also called "longevity noodles". What's more worth mentioning is that the Korean people later improved the cold noodles in many ways, decocting them with a variety of Chinese medicines and mixing them into cold noodle soup. Therefore, eating cold noodles in summer is not only cool, but also effective in relieving summer heat.