In a small bowl stir together the lemon juice, orange juice, ginger, tarragon, salt and pepper. Arrange the chicken breasts in a shallow glass or porcelain dish or enameled baking pan and pour the lemon juice mixture evenly over them. Marinate in the refrigerator, turning occasionally, for 2-3 hours.
To Freeze: Freeze in freezer safe container
To Reheat: Prepare a fire in the grill. Remove the chicken from the marinade and pat it dry with absorbent paper towels; reserve the marinade. Arrange the chicken on the rack. Grill, turning two or three times and brushing with the reserve marinade, until the chicken is no longer pink in the center, 15-20 minutes.