Combine first 3 ingredients in a shallow dish or large zip-top plastic freezer bag; add pork. Cover or seal, and chill 8 hours. Remove pork from marinade, discarding marinade. Sprinkle evenly with salt and black pepper.
Grill, covered with grill lid, over medium-high heat (350° to 400°) 8 to 12 minutes on each side or until a meat thermometer inserted into thickest portion registers 155°. Remove from grill, and let stand 10 minutes or until thermometer registers 160°. Slice pork, and garnish, if desired.