Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
     1/2  pound         deli roast beef
   1      package       au jus gravy
                        sub rolls

Preparation:

Prepare au jus according to package directions. Pour over roast beef in ziploc and freeze. Remove from freezer night before serving. Thaw all day in refrigerator; will marinate as it thaws. Butter and toast sub rolls. Heat roast beef in au jus till heated through. Layer with roast beef on rolls. Can serve with leftover au jus for dipping.