"It was high time these two dishes met...."
INGREDIENTS
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1 lb macaroni
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For the onion mix-in:
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3 tablespoons unsalted butter
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3 large white onions, thinly sliced
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2 teaspoons Worcestershire sauce
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1 teaspoon dried thyme
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3/4 cup dry sherry
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1 1/2 cups beef broth
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For the sauce:
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4 tablespoons (1/2 stick) unsalted butter
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4 tablespoons all-purpose flour
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2 cups whole milk
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3 cups Gruyere or Swiss cheese, grated and divided
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1 1/2 cups mozzarella cheese, grated and divided
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1/2 cup Panko breadcrumbs
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Kosher salt and freshly ground black pepper, to taste