1. To make marinade, combine all ingredients (except pork) in blender or food processor. Blend until mixture is smooth. Reserve 1/4 cup of marinade for basting on the grill. Pour remaining marinade into sealable plastic bag. Add pork; seal the bag. Marinate for at least 4 hours or overnight.
2. Heat a grill to medium heat. Remove pork from marinade. Place meat on grill. Close lid. Turn heat to low. Cook for 5 minutes before turning. Open lid. Baste pork with reserved marinade before turning. Turn pork; baste the other side. Close lid. Cook for 10 more minutes. Using instant-read thermometer inserted into center of meat, check the temperature. Continue to cook and baste until internal temperature is 150° F. Remove from grill. Let rest for 5 minutes before slicing. Serve as desired.
3. Note: Use chipotle peppers in adobo sauce from a can. Remaining peppers and liquid can be frozen for later use.

Calories: 151, Fat: 3 g (1 g Saturated Fat), Cholesterol: 58 mg, Sodium: 306 mg, Carbohydrates: 10 g,  Fiber: 1 g, Protein: 21 g.