1/2 cup frozen (thawed) orange juice concentrate
1/4 cup vegetable oil
1/4 cup lemon juice
2 tablespoons grated orange peel
1/2 teaspoon salt
1 clove garlic, finely chopped
6 boneless skinless chicken breasts (about 1 3/4 lb)
1. In shallow glass or plastic dish or resealable food-storage plastic bag, mix all ingredients except chicken. Add chicken; turn to coat with marinade. Cover dish or seal bag; refrigerate, turning chicken occasionally, at least 2 hours but no longer than 24 hours.
2. Heat gas or charcoal grill. Remove chicken from marinade; reserve marinade. Place chicken on grill over medium heat. Cover grill; cook 15 to 20 minutes, turning chicken and brushing with marinade occasionally, until juice of chicken is clear when center of thickest part is cut (170°F).
3. Heat remaining marinade to boiling; boil and stir 1 minute. Serve with chicken.