In a small sauce pan, bring all marinade ingredients to a boil, then reduce heat and simmer 1-2 minutes, stirring occasionally. Remove from heat and cool thoroughly.

Place turkey in a large shallow dish, pour marinade over turkey. Cover and chill 4-6 hours, turning occasionally.

Preheat grill to medium high or oven to 325 degrees.

Remove turkey from marinade, reserve marinade.

If grilling, grill tenderloins for about 10 minutes per side, quarter turning after 5 minutes. Grill until instant read thermometer reads 165 degrees (or slightly less when resting). Remove to a plate and cover with foil. Allow to rest 10 minutes before slicing (turkey will continue cooking, about 5 additional degrees).

If baking, place tenderloins on a rack in a shallow roasting pan. Bake for 30 – 40 minutes or until meat thermometer registers 165 degrees. Allow to rest for 10 minutes before slicing.

Boil reserved marinade for 1 minute and serve with turkey.