After you’ve had a roast chicken meal and shredded the leftovers, you’re going to be left with bones, small bits of meat, fat, and cartilage. Immediately toss all of these items into a large pot along with the onion, carrots, celery, peppercorns, bay leaves, garlic, parsley, and water.
Bring this to a simmer and cook, partially covered, for about 3 hours. Skim off