Guy Fieri heads out for serious fast food. He visits a Naraganset, R.I., joint with more than 20 burgers on the menu; a place in Eagle Rock, Calif., slow-smoking barbequed pork; a family-run taqueria in Rosenberg, Texas, where dessert is something called a "snoball".

Guy Fieri tries out favorites from around the corner and around the globe. In Chicago, a Peruvian joint serving classic lomo saltado (sauteed rib eye with French fries mixed right in) and beef heart; in Oklahoma City, a local institution where the bread's baked fresh daily and the schnitzel's done like back in Germany; and in South Buffalo, N.Y., a pub making the home town favorite, a sandwich called "beef on weck".