In a medium, heavy-bottomed Dutch oven or stock pot, heat oil over medium high heat. Stir in onions and zucchini and saute until very soft but not browned, about 10 minutes.
Pour in chicken broth and bring to a boil. When boiling, stir in lima and green beans, allow to return to the boil, then lower heat to a strong simmer. Cook, simmering, uncovered, until vegetables are soft, about 20 minutes.
Cool slightly just so soup is workable, and puree in batches in a blender or food processor.
By now the soup should be room temperature. Stir in pesto, sour cream, salt and pepper to taste. Serve chilled or at room temperature.
Serves: 4 to 6
Contributor: pat ciesla
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