The behind-the-scenes episode returns for a sprint across the belly of the SEC, in search of really good cheeseburgers. Highlights include: Burger Burger in Biloxi, Miss., for po-boy loaves, layered with double patties and onion sauce; Troy’s Snack Shack in Montezuma, Ga., for beautifully sloppy chili-slaw burgers; Hamburger King near downtown Montgomery, Ala., for burgers that pick up an ideal char from the griddle; and Downton Grill in Macon, Ga., for a conversation with Will and Jenni Harris of White Oak Pastures in downstate Bluffton, who talk with Edge about the new-old promise of raising beef cattle on grass.