How to Make It
Preheat oven to 450°F.
Pat fish dry with paper towels. Place fish in the center of a rimmed baking sheet lined with parchment paper. Arrange oranges, onion, beets, and carrot around fish. Combine oil, fennel seeds, salt, and pepper in a bowl; drizzle oil mixture over fish and vegetable mixture.
Bake at 450°F for 10 to 12 minutes or until fish flakes easily when tested with a fork. Sprinkle juice and tarragon over fish and vegetable mixture.