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Step 1: Mix up the Au Jus packet following the directions on the package.
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Step 2: Add the roast beef to the hot Au Jus.
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Step 3: Remove from the heat and cover with a lid until meat is warmed.
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Step 4: Heat the nacho cheese and spread mayo or butter on buns and toast them in a pan.
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Step 5: Build sandwiches by adding Horsey sauce, meat, cheddar sauce, and Arby's sauce.