Catfish Curry

Name: Catfish Curry
Ingredients: 2 pounds catfish fillets; 4 cups water; 2 medium onions, finely chopped; salt and ground black pepper to taste; 2 tablespoons all-purpose flour; 2 teaspoons curry powder; 2 tablespoons butter, at room temperature; 1 tablespoon chopped fresh parsley; 4 cups hot cooked rice