Mix marinade ingredients and pour into Ziploc storage bag.
Place 2 tenderloins in it and marinate for at least 6 hours in refrigerator or overnight. (For more tenderloins or larger party, double the marinade recipe in order to have adequate sauce. Remember to turn bag periodically to coat evenly.)
Cook tenderloin on charcoal grill until brown on outside-desired doneness inside. Baste during grilling with marinade.(Best when slightly pink on inside.)