Robert Irvine starts his cheat day quest in New Orleans, where he finds a decadent, gravy-smothered roast beef and fried shrimp po' boy. Then, in Los Angeles, the classic American grilled cheese gets a savory Mexican twist by adding tender roast marinated in sweet, smoky peppers. Finally, in Denver, a barbecue sandwich is taken to new heights with hickory-smoked beef, pork and sausage, slathered with homemade creamy cheese sauce and topped with beer-battered onion rings.

Robert Irvine tests his mettle in Downey, Calif., with a super spicy burrito stuffed with succulent marinated chuck roast and creamy nacho cheese. Then, in Denver, a decadent dark chocolate cake is pushed to new heights with whiskey, cherry pipe tobacco and hot chile peppers. Finally, in St. Louis, a noodle dish is smothered with Korean and Mexican sauces so seriously spicy, it's gone nuclear.