INGREDIENTS
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1 large butternut squash (about 3 pounds)
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1 (15-ounce) can pumpkin purée (not pumpkin pie filling)
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1 cup crème fraîche
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1 large egg, lightly beaten
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1 teaspoon dried sage
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1 teaspoon kosher salt, plus more for seasoning
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1/2 teaspoon ground nutmeg
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1 ounce baby arugula (about 2 cups lightly packed)
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1 pound grated Fontina cheese
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12 whole fresh sage leaves
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2 ounces finely grated Parmesan cheese