Preparing to smoke the Rib Roast Christmas Morning. First time and I need to know this Au Jus process. I have beef stock...how much do I put in the smoker under the roast? And what else do I do or add. Do I need to add the "Au Ju Packet" in the smoker to or mix and de-fat it while it is resting? Thanks for any advice. Au Jus is too short for the SEARCH option.