Grill Master Chicken Marinade

1/4 cup cider vinegar
3 tablespoons prepared coarse-ground mustard
3 cloves garlic, peeled and minced
1 lime, juiced
1/2 lemon, juiced
1/2 cup brown sugar
1 1/2 teaspoons salt
6 tablespoons olive oil
ground black pepper to taste
6 boneless, skinless chicken breast halves

In a large, nonreactive container, thoroughly mix cider vinegar, whole
grain mustard, garlic, lime juice, lemon juice, brown sugar, and salt. Whisk
in olive oil and pepper.
Place chicken in the mixture. Cover, and marinate chicken in the
refrigerator 8 hours, or overnight.
Preheat an outdoor grill for high heat, and lightly oil grate. Place
chicken on the prepared grill, and cook 10 minutes per side, until no longer
pink and juices run clear. Discard remaining marinade.