Bobby Flay makes a surprise guest appearance at a barbecue joint in New York with a one-of-a-kind brontosaurus beef rib; in Nashville, the local tradition is hot chicken; in Cleveland, the brunch burger.

In Nashville, Tenn., a burger joint that encourages custom creations; in Cleveland, a newcomer serving up pub food and house-made brews; in Brooklyn, N.Y., Carolina-style whole hog barbecue.

A Manhattan spot that combines a bottomless beer selection with high-octane hot dogs; in Ohio, a smoked meatloaf containing chorizo; burgers in Nashville.

In Cleveland, classic sweets are combined to make a dessert burger; in Brooklyn, an old school Jewish deli blended with traditional Canadian-style dirty fries; in Nashville, creamy mac and cheese and pulled pork.

In Hell's Kitchen, New York City, a spicy burger that uses four different types of peppers; in Nashville, chicken fried steaks and beer belly tacos; in Ohio, the secret to non-messy ribs.

Duff Goldman visits a Baton Rouge, La. smokehouse that boasts an outrageous pork belly hoagie; in St. Louis, a big fat Greek burger; in Austin, Texas, pit-roasted meats and spicy salsa atop tortillas.