For a Grad party, we have BBQ ckn. Parboil first? Cook raw and turn often, or put in lage tin pans on the grill above the hot coals in a pig roaster and then lightly sear on the grill. How best do I accomplish this? I have 100 leg and thigh pieces, 80 lbs of charcoal for the pig roaster and I need this timed well. What do you suggest?