Thai Grilled Chicken with Hot and Sweet Dipping Sauce

Name: Thai Grilled Chicken with Hot and Sweet Dipping Sauce
Ingredients: For the peppercorn-cilantro root paste:; 2 teaspoons black peppercorns; 2 tablespoons garlic, chopped; 3 tablespoons cilantro roots, chopped; Pinch salt; 1 teaspoon fish sauce; For the grilled chicken with sweet and hot dipping sauce:; 1/2 cup rice or cider vinegar; 1/2 cup sugar; 1 to 2 cloves of garlic, chopped; 1/4 teaspoon salt; 1 and 1/2 teaspoons dried red pepper flakes; 2 tablespoons fish sauce; 3 pounds chicken parts, cut into 10 to 12 pieces total