Adapted from The Eating Well Cookbook. Marinate chicken breasts in this mixture of three different kinds of mustard, vinegar, apple juice and lemon juice for a special taste.
Mix all the ingredients together, except the meat, in a shallow bowl. Add chicken and turn once or twice to coat.
Cover bowl and chill for 2-4 hours to marinate, turning occasionally.
When ready to grill, remove chicken from bowl. Discard marinade.
Place chicken on lightly oiled, preheated grill. Cook until meat is no longer pink inside, about 3-4 minutes on each side.