In a small bowl melt the butter in the microwave, typically 10 seconds. Add in the pepper and the lemon juice then stir.
Use a foil lined baking dish and spray with nonstick cooking spray. Place each fillet in the dish and then pour the mixture over the top of the fillets. A little bit goes a long way with this recipe.
Bake the fish for 30 minutes or until it flakes with a fork. I serve this dish with peas and a baked potato.