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This is the signature cheese layer in an Italian-American lasagna, typically made with a blend of ricotta, mozzarella, and Parmesan cheeses, often bound with egg and seasoned with herbs. It provides a creamy, rich texture that contrasts with the meat sauce and pasta layers, creating the dish's iconic hearty structure.
This layer is high in fat and protein from the cheese blend, with a moderate amount of carbohydrates from any added binders like egg or breadcrumbs. A typical serving of the cheese layer alone provides around 200-300 calories, along with calcium and sodium.
Culturally, this cheese layer is a hallmark of the Italian-American adaptation, as traditional Italian lasagna often uses béchamel sauce instead. Nutritionally, it's a significant source of calcium but also contributes substantially to the dish's overall saturated fat and sodium content.