Ingredients
7 1/2 pounds chicken wings
6 1/2 quarts low-salt chicken broth (preferably organic)
8 large carrots, thickly sliced, plus 2 cups 1/2-inch cubes
3 large onions, peeled, quartered
6 large celery stalks, thickly sliced, plus 2 1/2 cups 1/2-inch-thick slices
4 large parsnips, thickly sliced, plus 2 1/2 cups 1/2-inch cubes
2 whole medium leeks, halved lengthwise, rinsed, thickly sliced crosswise, plus 2 1/2 cups 1/2-inch-thick slices of white and pale green parts
1 1/2 cups plus 2/3 cup chopped fresh Italian parsley
3 tablespoons chopped thyme, divided