This pork sandwich comes breaded, fried and way oversized. Buttermilk is the secret ingredient in the Indiana pork-tenderloin sandwich. Up to a half pound of meat is pounded thin, marinated in buttermilk, breaded with cracker crumbs, fried and served, despite its size on a regular hamburger bun. At some restaurants, the pork is a foot in diameter! Try this recipe from the Food Network Kitchens. Note: Time does not include marinating time.