Smoke signals lead Roger Mooking to two popular food trucks in Texas serving up delicious ethnic eats. In Grapevine, Texas, Roger meets pitmaster Trey Sanchez of Vaqueros Texas Bar-B-Q, who's known for combining authentic Texas-style barbecue with Mexican dishes. Roger and Trey season and smoke briskets for Birria Tacos and prep Cowboy Potatoes for a pop-up with hungry locals at Hop and Sting Brewing Co. The chopped brisket is served in griddled corn tortillas with melted cheese, onions and cilantro, plus beef consomme for dipping. The smoked potatoes are diced and sauteed with onions, bell peppers and salsa in a metal disco set over hot coals, and both dishes are served with Trey's signature fiery, smoky salsas. In Austin, Texas, Justin and Lakana Trubiana park their food truck DEE DEE at Radio Coffee and Beer and serve authentic northeastern Thai dishes inspired by Lakana's family recipes. Roger and Justin light coals and preheat a massive, custom-built rotisserie that can cook up to 36 whole chickens that have been brined and rubbed with a flavorful paste of Thai aromatics and seasonings to create Gai Yang. As the succulent chickens spin and cook for two hours, Roger and Lakana grill Moo Ping, thinly sliced pork marinated in a top-secret family recipe and cooked on wooden skewers. Both dishes are served with Thai sticky rice and sauces that are both sweet and spicy.