Ingredient:

• 1 teaspoon butter, or as needed
• ¾ cup freshly grated Parmesan cheese
• ⅓ cup butter, softened
• ¼ cup mayonnaise
• ¼ cup chopped green onion
• 3 tablespoons lemon juice
• 2 teaspoons dried dill weed (Optional)
• ¼ teaspoon salt
• ¼ teaspoon ground black pepper
• 2 dashes hot pepper sauce (such as Tabasco®)
• 2 pounds cod fillets