1Place beef steaks in resealable plastic bag; pour in 1 cup marinade/dressing. Seal bag, squeezing out as much air as possible. Refrigerate 30 minutes to marinate.
2Heat gas or charcoal grill. Place steaks on grill over medium heat; discard marinade. Cook 10 to 12 minutes for medium doneness, turning once. Remove from grill; let steaks stand 5 minutes before slicing.
3Arrange 2 cups lettuce on each of 4 plates. Top each with avocado and red pepper. Arrange sliced steak on top of each. Sprinkle salads with cheese. Serve with 1/2 cup marinade/dressing on the side.