Lime-Cilantro Marinated Chicken

1 cup finely chopped red onion
1 cup lime juice
1/2 cup red wine vinegar
1/2 cup chopped fresh cilantro
1/4 cup oil
1/4 cup frozen OJ concentrate, thawed
1 3/4 tsp garlic salt
1 1/2 tsp seasoned pepper
1 tsp chopped fresh mint
2 chicken breasts
Combine all ingredients except chicken in bag. Remove 1 cup marinade for basting. Marinate @ least 45 minutes. Grill or broil. Baste with reserved marinade.