"A classic pasta dish that your family will love!..."
INGREDIENTS
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1 pound cremini mushrooms (sliced)
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8 tablespoons unsalted butter (room temperature, divided)
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1 teaspoon chopped rosemary
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1 pound fresh fettuccini
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1 cup pasta water (divided)
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1/2 cup freshly grated Parmigiano-Reggiano
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olive oil
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kosher salt and freshly ground black pepper