In the process of roasting meat there is never sufficient natural juices. Mix au jus base in boiling water to make as much clear, fat-free au jus as you want. Pour over prime rib, steaks, chops or roasts to add rich beef flavor. Add a dash of oregano for the perfect Italian beef or sausage sandwich. Turn mashed potatoes into a delicious treat by adding mushrooms and a dash of Burgundy wine to the au jus.