Tuong Goi Cuon (Hue-Style Peanut Dipping Sauce)
- Combine the hoisin sauce, water, bean sauce, vinegar, onions, and sugar in a pan over moderate heat and simmer until the onions are soft, about 15 minutes. Add the peanut butter and stir well. The sauce should be just thick enough to coat a spoon. If it is too thick, add a little water. Set aside to cool.
- When serving, transfer to an individual sauce bowl and garnish with chili paste and chopped peanuts. This sauce will keep up to two weeks if refrigerated.