1. Prepare grill.
2. Sprinkle steaks evenly with salt and pepper. Place steaks on grill rack coated with cooking spray; grill 5 minutes on each side or until desired degree of doneness. Let stand 10 minutes before slicing.
3. While steak stands, combine lettuce, tomato, and cucumber in a large bowl; divide evenly among 4 plates. Top salads with steak slices. Drizzle evenly with Creamy Horseradish Dressing.