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2 tablespoons extra-virgin olive oil
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1 large Spanish onion, chopped
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2 garlic cloves, chopped
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1 pound small turnips, peeled and coarsely chopped
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1/2 cup dry white wine
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4 cups chicken stock or canned low-sodium broth, plus more for thinning the soup
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2 tablespoons minced scallions
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1/2 cup crème fraîche
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Salt and freshly ground pepper
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Cheese Crisps, for serving
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Heat the olive oil in a large saucepan until shimmering. Add the onion and garlic and cook over moderately high heat, stirring occasionally, until softened, about 6 minutes. Add the turnips and cook, stirring frequently, until crisp-tender, about 5 minutes. Add the wine and cook until almost evaporated, about 5 minutes. Add the 4 cups of chicken stock and bring to a boil. Reduce the heat to moderately low and simmer until the turnips are tender, about 25 minutes.
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Working in batches, puree the soup in a blender or food processor, then strain it through a fine sieve. Return the soup to a clean saucepan, stir in the scallions and cook over moderate heat for 5 minutes. Whisk in the crème fraîche until fully incorporated; thin the soup with stock if necessary. Season with salt and pepper.
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Ladle the soup into shallow bowls and serve with the Cheese Crisps.
Make Ahead
The soup can be refrigerated overnight. Gently reheat.
