For a quick and easy beef broth au jus, you can either use bouillon cubes or beef fat drippings. To make the beef broth au jus more complex, add flavors from red onion and white wine.
For the fastest beef broth au jus, bring 3 cups of water to a boil. Turn down the heat to low, and whisk in 4 cubes of beef bouillon until completely dissolved. Add 1 teaspoon of soy sauce, 1/4 teaspoon of garlic powder, and salt and pepper to taste.
For a richer beef broth au jus, melt 1/4 cup of beef fat drippings from prime rib or roast beef over medium-high heat. Add 1 1/2 tablespoons of all-purpose flour, and whisk in. Afterward, pour in 2 cups of beef broth, and raise the heat until the mixture boils. Let it boil until it thickens to the desired consistency, and add salt and paper to taste.
To make a flavorful beef broth au jus without pan drippings, caramelize 1/4 cup chopped red onion in olive oil. Add 1 teaspoon minced garlic, cook for a minute and deglaze the pan with 1/8 cup of white wine. Next add 1 tablespoon of Worcestershire sauce, and continue to stir for one minute. Finally, add 2 1/2 of cups beef broth, bring it to a boil and simmer for half an hour. Afterward, strain the broth and whisk in 1 teaspoon of flour.