- 1 large fennel bulb—8 small fronds reserved, bulb cored and sliced 1/2 inch thick
- 2 tablespoons fresh lemon juice
- 2 tablespoons extra-virgin olive oil
- 1 3/4 pounds zucchini, sliced crosswise 1/4 inch thick
- 1 large onion, thinly sliced
- 1 large garlic clove, smashed
- 1 quart chicken stock
- Freshly ground pepper
In a medium saucepan, cover the sliced fennel with water. Add the lemon juice and a large pinch of salt and bring to a boil. Cover and simmer over low heat until the fennel is tender when pierced with a knife, about 20 minutes. Drain the fennel.
In a large pot, heat the olive oil. Add the zucchini, onion and garlic, season with salt and cook over moderate heat, stirring occasionally, until just softened, about 10 minutes. Add the chicken stock and cooked fennel and bring to a boil. Cover partially and simmer over moderate heat, stirring a few times, until the vegetables have softened completely, about 8 minutes.
Working in batches, puree the soup in a blender. Return the soup to the pot and season with salt and pepper. Ladle the soup into shallow bowls.