1-Whisk honey, soy sauce, oyster sauce, brown sugar, ginger, ketchup, garlic, parsley, onion powder, cayenne pepper, and cinnamon in a bowl; pour into a resealable plastic bag. Add pork, coat with marinade, squeeze out excess air, and seal the bag. Marinate in the refrigerator for up to 24 hours.
2-Preheat grill for medium heat and lightly oil the grate. Remove pork from the marinade, and shake off excess. Discard the remaining marinade.
3-Cook the pork tenderloins on preheated grill until no longer pink in the center, 20 to 30 minutes, turning occasionally. An instant-read thermometer inserted into the center should read at least 145 degrees F (63 degrees C).
Recipe by Donna Leigh.