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Rinse them under running water for a few minutes and pat them dry with a paper towel to absorb any excess water. Stir the melted butter and lemon juice together in a small bowl until the ingredients are completely combined and you've made a smooth butter mixture. Do the same with these ingredients until you've made a smooth flour mixture. The butter will make the flour mixture stick to the fish. Gently shake the fish to remove any excess mixture. Sprinkle the fish with paprika to taste. Garnish this fish with parsley sprigs and lemon slices and enjoy it while its warm.
Prepare the cod fillets. Preheat your oven to 350F (176C). Mix the butter and lemon juice. Mix the flour, salt, and white pepper together in a different bowl. Dip the cod fillets into the butter mixture and then coat the fish with the flour mixture. Place the fish in an 8" x 8" x 2" (20 cm x 20 cm x 5 cm) ungreased square baking dish. Pour the remaining butter mixture over the fish. Bake the cod fillets uncovered for 25-30 minutes, until the fish flakes easily with a fork. Serve.