Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   1 1/4  cups          cider vinegar
   4      teaspoons     chili powder
   2 1/2  teaspoons     sugar
   1      teaspoon      cayenne pepper
   1      teaspoon      dry mustard
   1      teaspoon      paprika
   1      teaspoon      black pepper
     1/2  teaspoon      cumin -- ground

Preparation:

Whisk all ingredients in small bowl to blend. Arrange chicken in shallow glass dis. Spoon 1/4 cup sauce over; turn to coat evenly. Let stand at least 10 minutes and up to 20 minutes, turning chicken occasionally. Grill chicken until just cooked through, basting occasionally with another 1/4 cup sauce. Serve with remaining sauce.