Use a broiler pan for both components of this recipe. The fennel-tomato mixture cooks in the bottom of the pan, helping to steam the fish on the rack above.
4 servings (serving size: 1 grouper fillet and 3/4 cup fennel mixture)
Preheat oven to 450°.
Combine first 4 ingredients. Add 1/4 teaspoon salt and 1/4 teaspoon pepper; toss well. Spoon mixture into bottom of a broiler pan coated with cooking spray. Bake at 450° for 10 minutes; stir once.
Combine 1/4 teaspoon salt, 1/4 teaspoon pepper, oil, and garlic; brush evenly over fish. Remove pan from oven. Place fish on rack of pan coated with cooking spray; place rack over fennel mixture.
Bake at 450° for 10 minutes or until fish flakes easily when tested with a fork.