INGREDIENTS
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1 1/2 pounds russet potatoes
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Kosher salt
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1 teaspoon finely ground pepper, plus 1 1/2 teaspoons coarsely ground
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Pinch of ground nutmeg
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1 large egg, lightly beaten
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1 to 1 1/4 cups all-purpose flour, plus more for dusting
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1 cup finely grated pecorino Romano cheese (about 2 ounces)
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4 tablespoons unsalted butter
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1/2 cup finely grated parmesan cheese (about 1 ounce)