Minestrone with Spring Greens

Name: Minestrone with Spring Greens
Ingredients: 3 tablespoons extra-virgin olive oil, plus more for drizzling; 4 ounces pancetta, diced; 1 large onion, chopped; 2 stalks celery, chopped; Kosher salt and freshly ground pepper; 3 cloves garlic, minced; 4 cups low-sodium chicken broth, plus more if needed; 1 small piece Parmesan rind, plus grated Parmesan for topping; 2 cups frozen lima beans, thawed (about 10 ounces); 1/2 small head escarole, chopped (about 6 cups); 1 cup ditalini (about 4 1/2 ounces); 1 bunch asparagus, tough ends trimmed, cut into thin rounds