Add water to cover carcass of what ever bird. Add some bay leaves celery, carrots and onions in a rough chop around 1 to 2 inch pieces. Simmer on low boil (barley and bubbles rising to top of stock) and reduce by half. Lid off. When reduced by half taste to check strength of natural flavor. Do not be afraid to simmer low and slow to extract all the flavor you can. I have gone 4-6 hours before on poultry carcass. When the natural flavor is where you want it you can add any seasoning you prefer. I usually add kosher salt and black pepper and let it simmer for another 30 minutes or so.