Flank Steak is a fairly thin cut, flavorful, and ideal for quick dinners. It's equally delicious marinated overnight or rubbed with salt and pepper right before cooking. It's forgiving of just about anything except overcooking, so we suggest grilling it (or searing it in a cast-iron pan) until just medium-rare. Let it rest for 10 minutes, then slice thinly against the grain and enjoy.