Zhajiangmian is a Shandong specialt, consisting of wheat noodles in soybean sauce and vegetables such as summer radish and sliced cucumbers. The sauce is usually made by cooking ground pork or beef in combination with fermented soybean paste. There is also a vegetarian version of the dish that substitutes the meat with smoked tofu in the production of the sauce.
Although the dish is native to China, it was embraced by the Koreans 100 years ago, when it was introduced to them by Shandong immigrants. In Korea, the dish is known as ja jang myun, and it is extremely popular because it is cheap, convenient, and casual.