Remove all the usable smoked turkey meat from the turkey carcass.
Place the turkey carcass into a large stock pot (bigger is better).
Cover with COLD water all the way up if you can).
Add the onion, carrots, celery, thyme, sage and the bay leaf to the pot.
Bring to a boil on high heat and then lower the heat to a simmer.
Add salt and pepper to the pot.
Cook with a loose cover for 3 - 4 hours.
First, pour the stock through a large strainer into another big basin to catch the onion, celery and carrots.
Then strain the stock through a fine mesh sieve or strainer.
Makes 4 to 6 quarts or more of stock, depending on the size of the turkey carcass, and how much water you added to cover it.