Heat oil in a Dutch oven or large soup pot over medium-high heat. Add leeks and cook, stirring occasionally, until soft, about 3 minutes. Add broth, water, potato, thyme, salt and pepper. Bring to a boil, reduce heat to low and simmer, covered, for 5 minutes.Advertisement
Add orzo and cook, partially covered, stirring occasionally to prevent sticking, for 5 minutes. Add beans and zucchini and continue to cook, partially covered, until the vegetables and pasta are tender, about 8 minutes more.
Stir in spinach and cook, stirring, until wilted, about 2 minutes. Season the soup with vinegar. Ladle into bowls and garnish with Parmesan.
Tip: To clean leeks, trim and discard green tops and white roots. Split leeks lengthwise and place in plenty of water. Swish the leeks in the water to release any sand or soil. Drain. Repeat until no grit remains.
2 1/2 starch, 2 vegetable, 1 plant-based protein, 1/2 fat