In a large saucepan, combine turkey carcass with 6 cups of water. Add carrots, celery and onion and let simmer for at least 1 hour. Best results if you let it simmer for a few hours on low until all the meat is falling off the bones.

Strain liquid and reserve. Pick out any meat remaining after it cools and reserve.

Pour broth into pot and add turkey meat, additional carrot, onion, celery and potatoes. Let simmer on low for an hour, and serve.