Mix all ingredients of the marinade in a large plastic bag. Place turkey breast in a large plastic bag and marinate in the refrigerator overnight. Remove turkey, and transfer marinade to a small saucepan, bring to a boil. Grill turkey breast, basting with reserved marinade, until the temperature registers 175 to 180 degrees, about 35 to 45 minutes for a 5-pound bird.
Transfer turkey to a cutting board and slice crosswise. Arrange slices onto a platter, spoon boiled marinade over the turkey slices.