A grilled rack of lamb, using the reverse sear technique, is a special treat when cooked properly. It turns the meat into super succulent and flavorful.
Remove the fat cap from the lam, peeling gently using your hands. Use a knife to make the final separation of the fat cap.
To french the bones: Turn the rack over so the bones are curled up towards you. Using the tip of your knife, carefully make an incision along the whole length of each bone through the membrane. Using your fingers, peel away the membrane, fat, and connective tissue from in between each bone. Use a dish towel to get a better grip. Scrape any remnants from the bones until they are clean.
Rub the lamb with the mustard. Sprinkle with garlic, thyme, salt, and pepper. Wrap the bones with aluminum foil, so they do not burn while grilling.
Preheat the grill to 250 degrees F (120 degrees C). Light your pellets to smoke.
Place the lamb on the GrillGrates and close the lid. Slowly cook the lamb until the internal temperature is 110 to 115 degrees F (45 degrees C).
Remove the lamb to a pan or cutting board and let rest, tented with aluminum foil.
Thirty minutes before you are ready to eat, increase the grill temperature to 650 degrees F (345 degrees C) for the final sear.
Place the lamb back on the GrillGrates and sear well. Rotate every minute or so, to get an even brown crust. Cook the lamb until a final internal temperature of 130 degrees F (55 degrees C).
Remove from the grill and place on a cutting board. Let rest for 2 to 3 minutes before slicing into individual chops.