How to Make It
Puree half of the chickpeas with 1 1/2 cups of the broth in a blender or food processor. In a large pot, heat the oil over moderately low heat. Add the carrot, onion, celery, garlic, and rosemary and cook, stirring occasionally, until the vegetables start to soften, about 5 minutes.
Stir in the remaining 1 1/2 cups broth, the pureed chickpeas, whole chickpeas, bay leaf, red-pepper flakes, tomatoes, tubetti, and salt. Bring to a boil. Reduce the heat and simmer, partially covered, for 10 minutes.
Add the Swiss chard to the pot. Simmer until the chard is tender and the pasta is done, 5 to 10 minutes longer. Remove the bay leaf. Stir in the black pepper. If the soup thickens too much on standing, stir in more broth or water.