Au jus is very simple to throw together! Reserve 4 tablespoons of the fat drippings from your roast (you can also use butter) and add it to a saucepan, add a clove or two of minced garlic, and cook for about 3 minutes then whisk in 2 tablespoons of flour. Cook until browned and thickened for another 2 minutes. Next, add in 2 cups of beef broth and 1/4 cup of red wine if you like, and let it simmer and reduce for about 15 minutes, season with salt and pepper to taste, and serve hot!