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In a large stockpot, sauté onions, carrot and celery in the olive oil until slightly carmelized and beginning to brown on the bottom of the pot, about 20 minutes. Add bourbon to deglaze the pot, and stir until you get all the browned bits off the bottom of the pot.
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Add rutabagas and chicken stock. Bring mixture to a boil, then reduce heat and simmer for about 30 minutes, until rutabaga is tender when pierced with a fork. Add salt and pepper to taste, and let cool slightly.
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Purée in batches in a high-powered blender, then transfer to a large 4 quart bowl.
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Stir in yogurt or cream, then taste again to correct for salt or pepper if needed. Serve immediately.