Wash your hands thoroughly.
In a bowl or pan, combine all of the marinade ingredients except the turkey breasts.
Pour the marinade into a self-sealing freezer storage bag.
Add the turkey breasts to the bag and seal it shut.
Place in the refrigerator and marinate for several hours (about 2 hours is good enough).
Remove the turkey breasts from the marinade and grill on direct medium heat for 8 minutes per side or until a meat thermometer registers 170 degrees F, and the turkey is no longer pink.
Discard the marinade.
Serve with your favorite side dishes!