Instructions: Wash, peel and slice the sunchokes and drop them into a bowl of cold water with the juice of 1/2 lemon as they are being prepared. In a large soup pot, heat the olive oil and saute the leeks, onion, and celery, stirring occasionally, for about 10 minutes or until soft. Add the sunchokes and garlic and saute a few minutes longer. Add the chicken stock, water, and tarragon. Bring to a boil, cover, and simmer for 20 to 30 minutes or until the sunchokes are tender. Let cool slightly. Puree in a blender with the yogurt and season with salt and pepper, to taste. Heat through and ladle into soup bowls. Garnish with a sprinkle of parsley.

Makes 6 servings.

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