Minestrone

INGREDIENTS

• 4 tablespoons extra-virgin olive oil, plus more for drizzling
• 1 onion, chopped (about 1 1/2 cups)
• 3 cloves garlic, minced
• 4 small zucchini, trimmed and quartered lengthwise, chopped into 1/2-inch pieces
• 3 celery stalks (the tender inner stalks with leaves), sliced crosswise into 1/4-inch slices
• 1 small head cauliflower, cored, florets removed and separated into bite-sized pieces
• 6 ounces green beans, sliced in 3/4-inch pieces (about 1 cup)
• 1 small head cabbage, cored, outer leaves discarded, and thinly sliced
• 16 ounces fresh or canned tomatoes, chopped (about 2 cups)
• 2 tablespoons coarse salt
• 1/2 teaspoon freshly ground black pepper, plus more for serving
• 1 rind of Parmesan cheese (optional)
• 1 1/2 cups cooked chickpeas, or 1 (15-ounce) can, rinsed and drained
• 2 large whole basil sprigs
• Freshly grated Parmesan cheese