1 boneless beef top sirloin steak, cut 1 inch thick (about 1-1/4 pounds) 1 medium yellow squash, sliced (1/2-inch) 1 medium zucchini, sliced (1/2-inch) 1 small red onion, cut into 1/2-inch thick wedges 8 medium mushrooms 1 tablespoon Dijon Style Read More …