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Nutrition information coming soon.
Place onion and roast in slow cooker.
Mix Seasoning Mix and water until well blended. Pour over roast. Cover.
Cook 8 hours on LOW or 4 hours on HIGH. Remove roast from slow cooker. Skim fat from au jus.
Slice beef into thin slices. Return beef to slow cooker. Serve on toasted rolls with au jus on the side for dipping.