1 pound boneless beef top sirloin steak, cut 3/4-inch thick, may be substituted for shoulder top blade (flat iron) steaks. Pan-broil 10 to 13 minutes for medium-rare to medium doneness, turning once. 4 crusty French rolls (about 2 1/2 ounces each), split, may be substituted for ciabatta bread. Toast and fill as directed above.