Zhaijiangmian is a favorite chinese noodle dish. There are many countries in the east that serve this delicious noodle dish with many different ingredients. For example, korean people serve this dish with julienned cucumber, onion, and yellow pickled radish. Beijing people like to cook the zhajiangmian sauce with small diced pork belly and serve it with julienne cucumber, the white part of spring onions and bean sprouts. Taiwanese people like to cook the sauce with mince, extra firm tofu, chili bean sauce, and sweet bean sauce. A final example is people from hong kong who like to cook zhaijangmian sauce with chili bean sauce and ketchup as the main seasoning ingredients then serve with julienned carrot, julienned pork and black vinegar. As with a lot of cantonese cooked food the flavor of the hong kong style zhajiangmian is sweet than in other places. You can store the sauce in the freezer in small portions and heat up in your microwave. This will save you a lot of time when cooking dinner.