Makes 4 servings. Total preparation and cooking time: 30 to 35 minutes Marinade time: 30 minutes to 2 hours.
1 pound beef top round or top sirloin steak, cut 3/4 inch thick or flank steak
1/2 cup prepared Italian dressing
Salt and pepper
2 large bell peppers, any color, cut into 1/8 inch strips
1 onion, cut into 1/8 inch wedges