Combine marinade ingredients (keep back the extra 2 TB of syrup) and whisk together in small bowl.
Cover pork tenderloin with marinade and refrigerate for at least 3 hours.
Preheat oven to 400°F or heat grill to medium high heat.
Remove tenderloin from marinade (discard marinade.) Place in roasting pan or directly on grill, brush with remaining maple syrup, and cook uncovered for approximately 8 to 10 minutes.
Flip tenderloin over and cook for another 10 minutes or until a meat thermometer reads 150 ˚F at the thickest portion of the loin.
Remove from oven, wrap loosely in tinfoil, and let rest for 5 to 10 minutes. Slice into medallions.