In a shallow bowl whisk together the hoisin sauce, diced garlic, sesame oil and red and black peppers. Add lamb loin chops and half of chopped cilantro. Turn to coat or place all in a plastic bag and turn to coat. Allow to marinate at least 30 minutes or longer.
Preheat grill to 350°F (medium heat). Clean and oil your grill.
Grill 3 minutes, turn each chop 90 degrees for that nice char grill look, and cook for another 3 minutes. Turn the chops over and baste with any remaining hoisin sauce. Cook for about 6 more minutes, turning halfway through. They should still be pink inside. Remove the chops from the grill and place on a warm plate to rest. Sprinkle with remaining chopped cilantro.