In the Season 4 premiere, Roger explores the wonders of smoked pork shoulder as he sinks his teeth into barbecue sandwiches, during trips to Grand Rapids, Michigan, and Blount Springs, Alabama.

Alabama barbecue is in the spotlight, when Roger visits "Big Bob Gibson Bar-B-Q" in Decatur, Alabama, and learns how to make their smoked chicken, dunked in a unique white sauce. Also: pulled pork, that cooks for nearly 30 hours, is served at the "Black Pit" in Mobile, Alabama.

Roger attends two low-country cookouts in South Carolina. Included: he helps build an outdoor pit for a traditional pig pickin'; and pitches in to get ready for a classic oyster roast.

Roger fills up on brisket, pork steaks and sausages during a trip to Texas, where he visits "Ronnie's BBQ" in Johnson City and the "Pecan Lodge" in Dallas.

Roger skewers all kinds of meat to be cooked on a massive grill, built by a chef for his San Antonio restaurant; and meets the designer of a 7-foot stainless steel tree, which they use to roast quails and sausages for an outdoor feast.

Chef Roger Mooking visits "Faith's Farm" in Bonfield, Illinois, where he's invited to take part in a feast, cooked on three different fiery contraptions. Included: a whole lamb, boar steaks and pig skins are on the menu for this Latin and Mexican-inspired meal.

Roger travels to Orangevale, California, where he grills steaks and chickens with a restaurateur who specializes in Santa Maria-style barbecue; and in Chicago, an 80-year-old seafood smokehouse is toured.

Roger Mooking's first time visiting Puerto Rico begins with a trip to a gas-station-turned-barbecue joint, where he's joined by fellow chef, Chuck Hughes. Also: sofrito-stuffed chickens are served at a popular roadside eatery.

Roger Mooking fires up Latin-inspired feasts in Florida and Georgia. He meets a maker of Argentinian grills, and they roast whole lambs together. Then he makes empanadas with braised pork cheeks in dough made from green plantains.

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The smoke signals of fiery feasts lure Roger Mooking to the Southwest, where his first stop is West Alley BBQ and Smokehouse in Chandler, Ariz. The hot spot specializes in Tennessee-style barbecue, and Roger helps founder Bardo Brantley and Pit Boss Robert "Jim Dandy" Spann load brick pits with over 300 pounds of pork. The pork butts are piled high in their signature sandwich, The Big Jim Dandy, and their fan-favorite ribs are tossed in a barbecue sauce with a heavy hit of cayenne. For his second stop, Roger gets lucky in Las Vegas, where he meets Chef Justin Kingsley Hall of The Kitchen at Atomic. His portable rig known as "The Swing Set" is anything but child's play. To build this winning jackpot of meat, Roger and Justin suspend Mediterranean spice-rubbed legs of lambs, nestle butternut squash into a bed of coals and grill carrots in a swinging basket.

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.

Roger Mooking goes hog-wild at two legendary barbecue restaurants located in America's Barbecue Belt. At A&R Bar-B-Que in Memphis, Roger helps owner Andrew Pillard load racks of St. Louis-style ribs into custom wood-fired pits. Andrew also shows Roger how to make Barbecue Spaghetti, a dish created in Memphis in the 1950s. In Lexington, N.C., Roger visits Bar-B-Q Center, a local institution famous for its chopped pork sandwiches and massive ice cream sundaes. Roger and co-owner Cecil Conrad fire up big brick pits with oak and hickory wood and then load salted pork shoulders to cook low and slow for ten hours before they're chopped and piled onto soft buns. And no trip to Bar-B-Q Center is complete without their famous banana split that weighs a whopping four pounds!

Roger Mooking heads to the South to visit two family-run barbecue joints that have been passing down recipes and rigs for generations. At Smokin' Joe's Bar-B-Que in Townsend, Tenn., pitmaster Zack Peabody honed his barbecue chops under the watchful eye of his grandfather, Joe Higgins. Zack and Joe built a smoker that can cook up to 1,000 pounds of meat, and Roger and Zack arrange briskets and pork butts on its shelves. At Shack in the Back BBQ in Fairdale, Ky., Mike and Barbara Sivells converted an old log cabin into a barbecue restaurant. Roger and Mike load pork shoulders and turkey ribs into the smoker to create two popular dishes: The Hump and Turkey Ribs.

Roger Mooking meets up with a few culinary titans in Tennessee who are swinging for the fences with outrageous rigs. At Wedge Oak Farm in Lebanon, Tenn., he joins Chef Trey Cioccia, owner of Nashville's Black Rabbit, to set up the Burn Tower. On this unique rig, meat, fish and vegetables are hung at varying heights around a metal cylinder filled with hot coals. In Nashville, Roger hangs with James Peisker and Chris Carter, the owners of Porter Road Butcher. Chris shows Roger an old swing set that he transformed into a cooking contraption, and they hang meaty rib roasts and fill a basket with chorizo and kielbasa.

In Fort Worth, Texas, chef and restaurateur Lou Lambert invites Roger to his ranch to slow-roast whole hogs over oak coals in a massive, custom-built metal rig; dessert is a sweet treat inspired by Lou's chuck wagon cooking days.

Roger Mooking makes two pit stops in the South for a little sizzle and a lot of smoke. He starts at Comfort Farms in Milledgeville, Ga., a nonprofit organization where retired veteran Jon Jackson helps fellow vets adjust to civilian life by teaching them how to farm, raise animals and cook. Jon often hosts cookouts to thank and feed his community, and Roger joins him to cook a whole mutton seasoned with garlicky rosemary paste and slow-roast cauliflower, broccoli, beets and onions. Roger then heads to Bob Sykes Bar-B-Q in Bessemer, Ala., for classic, open brick-pit barbecue. He learns the tricks of the trade from seasoned pitmaster Van Sykes, who has been stoking coals since he was 8 years old. They season 250 pounds of picnic pork with salt and load it into a 15-foot pit heated with hickory wood. The pork is then sliced, topped with just enough vinegar-based barbecue sauce and sandwiched inside a toasted bun with sliced pickles.