Roger Mooking meets two barbecue brainiacs who have mastered the art of marrying heat and meat to turn out top-notch barbecue. Pitmaster Christopher Prieto teaches students the science of smoking and seasoning meats at Prime Barbecue in Knightdale, N.C. Roger helps Prieto season a whole hog with Puerto Rican flavors, and then they smoke it in a North Carolina-style pit using coals made from pecan, hickory and cherry woods. In Glen Allen, Va., Roger meets Tuffy Stone, a classically trained French chef, cookbook author, champion pitmaster and the owner of local barbecue chain Q Barbeque. When Tuffy's not tinkering in the kitchen, he's busy building rigs from scratch, and Roger helps fire up his latest contraption with hickory coals and then hang whole spiced and buttered chickens.