Prep: 9 minutes; Cook: 6 minutes
1. Prepare grill.
2. Brush steaks with oil; sprinkle evenly with pepper and salt. Place fish on grill rack coated with cooking spray; grill 3 minutes on each side or until medium-rare or until desired degree of doneness.
3. While fish cooks, combine cucumber and remaining 4 ingredients in a medium bowl, tossing well. Serve relish over fish.