Buckwheat noodles are a popular food in Japan. There are many small restaurants selling buckwheat noodles in the streets and alleys of Japanese cities. Buckwheat is a kind of famine relief food in Nara Dynasty and Heian Dynasty of Japan. But now it has become a more delicate food. However, at present, few Japanese farmers grow their own wheat, mainly relying on imports from China, Canada, Africa and other places. Buckwheat noodles are cooked, put on a small steamer, and made into juice with soy sauce, sugar, cooking wine and dried bonito. Add chopped green onion and radish sauce when eating, and eat noodles in the juice. If you like spicy food, you can also put a little pepper. I found in Japan that most Japanese don't chew wheat flour, but suck it bit by bit. It is said that only in this way can it taste.