Directions

1. Combine spinach, avocado, tomatoes, cheese and walnuts in large bowl; toss gently.
2. Combine vinegar and oil in small bowl. Brush 1/4 cup vinegar mixture over salmon fillets; season with salt and pepper to taste.
3. Coat grill rack with nonstick cooking spray. Preheat grill to medium (300°F to 350°F). Grill salmon, covered with grill lid, 4 to 6 minutes per side or until fish flakes easily with a fork. Arrange over spinach leaves and serve with remaining vinegar mixture.