INGREDIENTS
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1 teaspoon butter, or as needed
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2 pounds cod fillets
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3/4 cup freshly grated Parmesan cheese
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1/3 cup butter, softened
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1/4 cup mayonnaise
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1/4 cup chopped green onion
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3 tablespoons lemon juice
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2 teaspoons dried dill weed (optional)
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1/4 teaspoon salt
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1/4 teaspoon ground black pepper
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2 dashes hot pepper sauce (such as Tabasco®)