Sauté chopped celery and onion in hot olive oil in a Dutch oven over medium-high heat 8 minutes or until tender.
Add zucchini and next 4 ingredients. Bring to a boil over medium heat; reduce heat to low, and simmer 10 minutes or until zucchini is tender. Remove from heat, and let stand 20 minutes.
Process soup, in batches, in a blender or food processor 30 seconds or until smooth. Return soup to Dutch oven, and cook over medium heat 5 minutes or until thoroughly heated. Garnish, if desired.
Note: You can also process soup with a handheld immersion blender directly in Dutch oven.
Note: Nutritional analysis does not include garnishes.
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