On this trip, Guy Fieri's unhinging the jaw for some stellar sandwiches and big-time burgers. In Palm Desert, Calif., an Italian market-deli is pilin' up the porchetta, and a funky burger joint is adding their own over-the-top twists. And in Nashvill... (more)e, a Vietnamese spot is makin' the bomb banh mi and a mind-blowing steak and rice bowl.