Note: This will give you 2 cups of only sightly thickened gravy. IF you want a really thick gravy without using up a ton of stock, use a bit (1 tsp) of cornstarch stirred up in a little water. Add this slurry to the gravy after you've let it reduce just a bit, for about 5 minutes. Stir up and keep an eye on it. Add more broth if you've added too much cornstarch.