INGREDIENTS
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2 tablespoons neutral oil, such as canola or grapeseed oil
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4 to 5 medium russet potatoes (1 pound), peeled and roughly chopped
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3 large leeks (1 pound), cleaned and thinly sliced
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6 cups vegetable stock (or light chicken stock)
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Kosher salt, to taste
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1 to 2 tablespoons freshly squeezed lemon juice
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1/2 cup heavy cream
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1/2 cup crème fraiche
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1/3 cup minced parsley or chives