DO-AHEAD TIP: Cook and chop chicken (if not using leftover turkey).
Melt the ghee or oil in a large saucepan over medium heat.
Raise heat to medium-high and add celery, onion and garlic; cook and stir for 2 to 3 minutes. Reduce heat to medium and add remaining ingredients, except cilantro.
Bring mixture to a low boil then reduce heat and simmer for 10 minutes; serve topped with chopped cilantro.