The central of Vietnam is reputable for its Mam tom chua (sour shrimp sauce) and Hue is the best place for this unique sauce. Unlike normal shrimp sauce (has brown color and smooth surface), Sour shrimp sauce has orange color while shrimps still keep its original shape. It is quite simple to make this sauce. First, shrimps are clean by salt water (do not use normal water to avoid bad smells) and “cook” by strong rice wine. The shrimps will turn red. After that, carefully mix the shrimps with sticky rice, sliced lesser galangal, garlic and chili. Slowly put all the mixture into a jar covered by guava leaves. Just need to wait for 5-7 days and we have the mouthwatering sour shrimp sauce of our own making. This is the best sauce for boiled pork with vermicelli.