1. Brush fillets with oil; sprinkle with salt, dill and pepper. Using long-handled tongs, moisten a paper towel with cooking oil and lightly coat the grill rack.
2. Grill tilapia, covered, over medium heat for 5 minutes. Turn tilapia; top with cheese, lemon and mango. Grill 4-6 minutes longer or until fish flakes easily with a fork. Yield: 4 servings.