Nuoc Tuong Ngot (Hoisin Dipping Sauce) is a favorite of mine with spring rolls. This was adapted from another recipe, though origin is unknown.
1/2 cup hoisin sauce
1 1/2 tablespoons rice vinegar
1/2 cup milk
3 tablespoons roasted peanuts (there was another recipe for this, but I made it up to save time)
3 tablespoons shredded carrots
1 red chili pepper, julienned (Optional)
2 Tablespoons Peanut butter (Optional)
In a saucepan combine the hoisin sauce and the rice vinegar, put over medium heat and stir in the milk. Continue to stir just before boiling point is reached, then add peanut butter (if desired), mix well and remove from heat and allow to cool to room temp. To serve, chop the roasted peanuts, carrot and finely slice the chilli to garnish the sauce.
The sauce will keep for up to a week in the fridge.