Add the leftover turkey bones and meat to a large pot. You may need to break the carcass apart a bit to fit into your pot. If you still have the giblets and neck you can add as well as they would both help to add flavor to your broth.
Add enough cold water to cover the bones. Then add the carrots, celery, onions, spices, and herbs to the pot and gently mix all the ingredients in so everything is soaking in the water.
Bring the water to a boil on high heat. Once boiling, reduce the heat and skim any scum that may float to the top of the pot. Then simmer for 2-4 hours (the longer the better).
Once the broth is done simmering, remove the larger bones and vegetable pieces with a wire strainer or tongs. Then strain the rest of broth into a large bowl (you may need a couple bowls depending on the size of the turkey).
Allow your broth to cool for a bit at room temperature then put in the fridge overnight.
The next morning, remove the broth from the fridge and skim any fat that may have floated to the top of the broth.
Your broth is ready! You can store it in the fridge for up to 3 days and in the freezer for up to six months. Enjoy!