This sweet-sour-salty dipping sauce is a pungent counterpart to the cool Fresh Shrimp Spring Rolls. Tamarind concentrate is available in jars at Asian groceries. As a substitute, use cherry juice concentrate, available in health food stores, or a bit of orange marmalade and fresh lemon juice.
In a small saucepan or the microwave, heat the sugar and water so the sugar dissolves. Mix in the lime juice, tamarind concentrate, and fish sauce, stirring until smooth. Let cool slightly and stir in the cilantro, garlic, and chile. The sauce should be tangy and slightly sour.