1. Combine 1st 8 ingredients in a small sauce pan and cook over medium heat for 4-5 minutes. Remove from heat and cool slightly. Set aside 1/2 cup of marinade for serving. Place remaining marinade in a large zip top bag.
2. Place tenderloins in the zip top bag and marinate for at least 30 minutes. Longer is better. Remove pork from marinade and discard remaining marinade. PReheat grill to medium-low.
3. Place soaked plank on grill, close cover, and heat for 3 minutes. With tongs flip the plank. Place tenderloins on the heated side of the plank. Grill with closed lid for 15-20 minutes, pork should reach temp of 145F. Remove from grill and tent with foil for 5 minutes. Slice and serve with reserved sauce.
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