INGREDIENTS
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1 pound cavatappi (ridged corkscrew pasta) or penne rigate
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1 3/4 pounds butternut squash, peeled, seeded, and cut into 1-inch pieces (about 3 1/2 cups)
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3 garlic cloves, finely chopped
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1 tablespoon olive oil
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1 cup water
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1 teaspoon finely chopped fresh sage
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1/2 teaspoon salt
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3 tablespoons unsalted butter, cut into 1/2-inch cubes
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2 ounces finely grated Parmigiano-Reggiano (1 cup) plus additional for sprinkling