I used chicken broth instead of beef broth (for turkey gravy). I added two cups of turkey drippings. When you have taken your turkey out of the oven, pour the drippings (what’s left in the roasting pan after cooking the turkey. This includes fat that has melted and any bits of meat that have fallen off) from your turkey roasting pan into a large bowl. (Tip the pan away from your body and be careful not to burn your self)!
Now let the drippings sit for a minute, allowing the fat to naturally separate from the rest of the drippings. You will notice that the fat will rise to the top, leaving the drippings and liquid on the bottom. Use a large spoon or ladle to skim (remove) most of the fat from the top of the the drippings. 1 cup is added at the stage with the flour in the recipe I sent. 2nd cup is added with the broth. Also I think because of all the extra drippings, I almost had to double the corn starch. Not quite double but basically keep adding corn starch but by bit until thick enough