Chris Schlesinger is the owner of the acclaimed East Coast Grill in Cambridge, Massachusetts, and the author of several cookbooks, most notably on the fine art of grilling and on salsas. His Inner Beauty line of hot sauces and spice rubs is popular with heat aficionados. In this mouthwatering recipe, Chris uses the less tender flank steak because he finds it so flavorful, and he tenderizes it by using a marinade.