"Contrary to popular belief, fettuccine Alfredo—the original from Rome, at least—isn't meant to have cream. It's just: fettuccine, butter, and cheese...."
INGREDIENTS
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4 ounces fettuccine, preferably fresh (but dried is good, too)
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Kosher salt, to taste
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2 tablespoons unsalted butter, divided
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1 small shallot, thinly sliced
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1/2 cup grated Parmesan, plus more to taste
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Freshly ground black pepper, to taste