Youmian noodles are common in the market, but it is best to choose square noodles for cold youmian, which is more gluten-free. Remember to steam the oat noodle in the pan first, which is the key. And it must be mixed while it is hot, so that the seasoning juice can be inhaled into the noodles and it is delicious. While steaming noodles, prepare minced garlic and chopped green onion, and fry some sesame seeds. As long as the noodles are hot enough, take them out, add salt, monosodium glutamate or chicken essence, and add a little sugar to improve the taste, but not too much. Color with soy sauce, and add vinegar, sesame oil, garlic, onion and fried sesame seeds. Add hot pepper oil to it, and add Chili oil to those who like Chili, and mix well. Don't eat it until it is cold. The noodles are strong and delicious. If they are not cold, the noodles will be soaked in the juice and affect the taste. By the way, it can be more refreshing with some shredded cucumber!