"Fusilli works best here, but a short, ridged pasta like penne rigate would also work well...."
INGREDIENTS
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Kosher salt
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3/4 to 1 lb. young spinach, trimmed, washed, and dried well
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2 Tbs. extra-virgin olive oil
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4 small scallions, chopped
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Freshly ground black pepper
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1 cup ricotta cheese, preferably fresh
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1 cup half-and-half or light cream
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Pinch nutmeg (optional)
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1 Tbs. unsalted butter
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1 lb. dried fusilli
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1/2 cup freshly grated Parmigiano-Reggiano