It's all about the beef on this trip as Guy Fieri pops into a classic diner in Marietta, Georgia, for a taste of what's topping the charts these days. Next, it's on to San Antonio where a carwash-laundromat-kitchen combo is crankin' out killer burgers. And in Gilbert, Arizona, there's a joint pullin' all their ingredients from their own backyard and giving new meaning to the phrase, "farm to table."