Heat the olive oil over medium-low heat in a large, heavy soup pot or Dutch oven. Add the onion, carrots and celery. Cook, stirring, until beginning to soften, about three minutes. Add 1/2 teaspoon salt and the leek. Continue to cook, stirring often, until tender, about three minutes. Add the garlic, stir for about a minute, and then stir in the water, tomato paste and the bouquet garni. Bring to a simmer. Add salt to taste, reduce the heat to low, cover and simmer 30 minutes. Stir in the chickpeas. Taste and adjust salt. Remove the bouquet garni.
Step 2
Add the Swiss chard and the pasta to the soup, bring back to a simmer, and simmer another 10 minutes or until the pasta is cooked al dente. Grind in some pepper, taste and adjust seasonings. It should be savory and rich-tasting. Serve in wide soup bowls, with a sprinkling of Parmesan over the top.