Mile Ends Chicken Soup with Soup Mandel

Name: Mile End's Chicken Soup with Soup Mandel
Ingredients: 3 small chickens (about 2 1/2 pounds each), each cut into 8 pieces; 10 black peppercorns; 2 teaspoons Diamond Crystal kosher salt, plus more to taste; 4 medium parsnips, peeled, 2 left whole and 2 cut into 2- to 3-inch batons; 4 medium carrots, peeled, 2 left whole and 2 cut into 2- to 3-inch batons; 4 stalks of celery, trimmed, 2 left whole and 2 cut into 2- to 3-inch batons; 3 large onions, peeled, 2 cut in half and 1 coarsely chopped; 3 sprigs of dill; 3 sprigs of flat-leaf parsley; 3 sprigs of thyme; 2 fresh bay leaves; Soup Mandel, for garnish