In a small bowl, combine the pineapple, onion, green pepper, cilantro, 1 teaspoon lime juice, 1/8 teaspoon salt and cayenne. Chill until serving.
Combine oil and remaining lime juice; drizzle over fillets. Sprinkle with pepper and remaining salt.
Using long-handled tongs, moisten a paper towel with cooking oil and lightly coat the grill rack. Grill fish, covered, over medium heat or broil 4 in. from the heat for 3-4 minutes on each side or until fish flakes easily with a fork. Serve with salsa. Yield: 2 servings (1/2 cup salsa).