2 ounces pancetta, cut into 1/2-inch pieces
1 small carrot, peeled and cut into 1/2-inch pieces
1 small celery rib, cut into 1/2-inch pieces
4 garlic cloves, peeled
1 onion, halved and cut into 1-inch pieces
1 (14-ounce) can whole peeled tomatoes, drained
¼ cup extra-virgin olive oil, plus extra for serving
1 anchovy fillet, rinsed, patted dry, and minced
¼ teaspoon red pepper flakes
2 teaspoons minced fresh rosemary
2 (15-ounce) cans chickpeas (do not drain)
2 cups water
Salt and pepper
8 ounces (1 1/2 cups) ditalini
1 tablespoon lemon juice
1 tablespoon minced fresh parsley
1 ounce Parmesan cheese, grated (1/2 cup)