2. In a flameproof casserole, heat the oil over medium heat and add the onion and carrots. Cook, stirring often, for 15 minutes, or until tender. Add the garlic, thyme, bay leaf, and 2 teaspoons salt. Cook for 5 minutes longer. Add the water and bring to a boil.
3. Stir in the leek and green beans. Continue cooking for 5 minutes. Add the zucchini and tomatoes. Continue cooking for another 15 minutes. Taste for salt and add more, if you like.
4. Add the cooked beans, 1 cup of the reserved cooking liquid, and the spinach. Continue cooking for 5 minutes. (The soup simmers for 45 minutes.) If the soup is too thick, add more cooking liquid. Remove the bay leaf.
GARNISH
| | 2 teaspoons olive oil1 tablespoon grated Parmesan, or more to taste 1. Ladle the soup into bowls.
2. Sprinkle each with olive oil and Parmesan. - Adapted from "The Art of Simple Food"
Notes: