3.

Light one chimney full of charcoal. When all the charcoal is lit and covered with gray ash, pour out and arrange the coals on one side of the charcoal grate. Set cooking grate in place, cover grill and allow to preheat for 5 minutes. Clean and oil the grilling grate. Place racks of lamb over hot side of the grill, fat side down, and cook until well browned, 3-5 minutes. Transfer lamb to a cutting board.