In a saucepan large enough to hold the roast beef, combine the Au Jus and brown gravy mixes, add two cups of cold water and whisk, to mix. Heat and stir until mixes are dissolved. Add roast beef and let meat heat through. Remove meat from liquid and pile 4 to 6 ounces of meat on each sandwich bun. Pour the Au Jus/gravy mixture in small serving bowls (or dessert dishes) so those that desire to do so can dip their sandwiches. Serve with mashed potatoes and fresh vegetables with dip.
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