Mexican Matzo Ball Soup with Chipotle and Lime

Name: Mexican Matzo Ball Soup with Chipotle and Lime
Ingredients: 1 whole chicken (about 4 pounds); 2 large carrots, peeled and halved crosswise; 1 parsnip, peeled and halved crosswise; 2 stalks celery, halved crosswise; 1 large white onion, peeled, and halved through the root; 2 medium leeks (white and light green parts), end trimmed, halved through the root, and rinsed; 6 garlic cloves, peeled and smashed; 1 bay leaf; 1 tablespoon black peppercorns; 1 dried chipotle chili, split lengthwise and seeds removed; 1/2 cup loosely packed fresh cilantro, stems okay; Kosher salt and freshly ground pepper; 4 eggs, lightly beaten; 1/4 cup vegetable oil; 1 cup matzo meal; 2 tablespoons chopped fresh, flat-leaf parsley, optional; 2 tablespoons seltzer water; For serving: Lots of lime wedges, finely chopped white onion, fresh cilantro leaves, and finely chopped avocado