INGREDIENTS
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2 tablespoons unsalted butter
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1 large leek, white and light green part only, chopped (about 1 cup)
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1 3-to-4-pound butternut squash, peeled and cubed
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1/4 teaspoon freshly ground nutmeg
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1/2 teaspoon freshly ground black pepper
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Salt to taste
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3 tablespoons dry sherry, plus more to finish
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2 to 3 cups chicken stock
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1 cup milk
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2 tablespoons heavy cream, plus more for serving