Grilled Salmon With Tomato Relish

: In a small bowl, combine vinegar, mustard, water, and salt if desired. Add onion, capers, and tomato, mix well, cover, and set aside. Brush salmon lightly with oil, sprinkle with salt and pepper, and broil or barbecue, turning once, about 4 minutes on each side or until fish flakes easily. Serve immediately, topped with the tomato relish. Recipe Source: LIGHT and EASY by Barbara