In a sauce pan, fry bacon until brown and crispy (do not drain). In with the bacon and bacon fat, sauté onions, celery, and garlic. Once the celery is soft add vinegar. Bring to a simmer (not boil). Once simmering add chicken stock and cornstarch and bring back to a simmer.
Add brown sugar, thyme, and salt and pepper to taste. Remove from heat immediately and serve hot.
Submitted by: Brittany