If you are lucky enough to have a separate grill, heat it to low now. If you only have the one grill, remove the chicken and heat it to low or build a bed of low coals in the grill. Place the chicken on the racks and grill for 20 minutes, flipping as necessary to stop flare-ups from the fat that rendered out while smoking. After 20 minutes,work in a sequence and brush with your favourite barbecue sauce. Immediately after brushing all the pieces, flip the chicken and begin your sequence again, brushing each piece. Continue the flip-and-brush sequence for 10 minutes, until you have a thick, sticky layer of caramelized sauce. When it reaches this stage, quickly transfer from the grill to a serving plate.