INGREDIENTS
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2 tablespoons unsalted butter
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1 large leek, thinly sliced and cleaned (about 1 cup)
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1 3- to 4-pound butternut squash, peeled and roughly cubed
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1/4 teaspoon freshly grated nutmeg
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1/2 teaspoon freshly ground black pepper
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Kosher salt, to taste
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3 tablespoons dry sherry, plus more to finish
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2 to 3 cups chicken or vegetable stock
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1 cup whole milk
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2 tablespoons heavy cream, plus more for garnish
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Sherry vinegar, to finish