"Macaroni and Cheese..."
INGREDIENTS
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5 tablespoons butter, plus more for the baking dish
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1 pound elbow macaroni
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1/2 cup all-purpose flour
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6 cups whole milk
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2 cups grated Gruyere (8 ounces)
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1 1/2 cups grated Cheddar (6 ounces)
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1/4 teaspoon cayenne pepper
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Kosher salt