Sweet noodle sauce and dried yellow sauce. The fried sauce of tomato Zhajiang Noodles is mainly sweet noodle sauce and dried yellow sauce. Among them, dried yellow sauce may be the first choice for making fried sauce because yellow sauce was relatively cheap when it was poor in the past. Zhajiang noodles, a traditional noodle in China, is known as one of the "Top Ten Noodles in China" and is a Beijing delicacy. Its main materials are noodles, soy sauce, bean sprouts, cucumbers and so on. There are salty and sour, and there are few cool. Zhajiang Noodles is very popular in the north of China, while Shaanxi, Tianjin, Shanghai, Guangdong and Northeast China also have Zhajiang Noodles in different ways. South Korea also has Zhajiang Noodles, which was brought to South Korea by overseas Chinese from Shandong Province. Spring sauce (black bean sauce) is used as seasoning, with onions, shrimps and meat.