2Combine hoisin sauce and next 7 ingredients (hoisin through garlic) in a small bowl; stir with a whisk.
3Slice pork lengthwise, but not through to the other side.
Open halves, laying pork flat. Sprinkle pork with salt and pepper.
Place pork on grill rack coated with cooking spray; cook 5 minutes. Turn and baste pork with hoisin mixture; cook 5 minutes. Turn and baste pork again with more hoisin mixture; cook 5 more minutes or until pork reaches 155°.