Sinful Sandwiches 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 savoury 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