Ingredients:
Meatballs:
1/4 medium onion
2 cloves garlic
Kosher salt and freshly ground black pepper
1/4 cup flat-leaf parsley leaves
1 large egg
1 pound ground dark meat turkey
1/3 cup grated Parmesan
Soup:
3 tablespoons olive oil
3/4 medium onion, chopped
1 celery rib, chopped
1 medium carrot, chopped
6 cups chicken broth
1 Parmesan rind (optional)
4 cups chopped escarole (from about 1 head)
2 tablespoons chopped parsley
Parmesan, for serving
Extra virgin olive oil, for serving