- 1 pound flounder fillets
- 1/2 teaspoon salt
- ground black pepper to taste
- 1 tablespoon lemon juice
- 2 teaspoons melted butter
- 1 teaspoon minced onion
- Preheat oven to 400 degrees F (200 degrees C).
- Place flounder in a baking dish; season with salt and pepper. Mix lemon juice, butter, and onion together in a bowl; pour over flounder.
- Bake in the preheated oven until fish is opaque and flakes easily with a fork, 25 to 30 minutes.