Flank steak is one of those cuts of meat custom-built for the grill. When cooked right, it has a mild, beefy flavor and lean texture, with just the right amount of chew when you slice it thinly across the grain. Butterfly that flank steak and stuff it with flavor-packed ingredients like Italian cold cuts, cheeses, and punchy condiments, and you're really in business. A nice flank steak pinwheel is one of the fastest-cooking and most impressive-looking pieces of meat you can throw on the grill, the kind of thing to pull out when you want to impress the neighbors.