Instructions: In a 3- to 4-quart pan over high heat, frequently stir celery and onion in oil until lightly browned, about 5 minutes. Add yams, apples, and broth; bring to a boil, cover, reduce heat, and simmer until yams are tender when pierced, about 15 minutes.

With a slotted spoon, transfer vegetables and apples to a blender or food processor; whirl until smooth, adding enough cooking liquid to puree easily. Pour puree back into pan and stir over medium-high heat just until steaming, 2 to 3 minutes.

Ladle soup into wide bowls. Add yogurt, salt, and pepper to taste.

This recipe yields about 6 cups; 4 servings.

Comments: As a vegetarian, Bettigene Reiswig finds the ingredients she prefers to eat and cook with are well suited to thick, hearty, satisfying soups. She uses vegetable broth for this mixture, but suggests chicken broth for others who prefer its richer flavor.

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