Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
  16      slices        rye bread
                        Soft butter
   8      slices        Swiss cheese
   8      slices        liverwurst
   8      slices        red onion
                        Dijon or Deli mustard

Preparation:

Butter 8 slices of bread. Top each with a slice of cheese, liverwurst, and onion. Spread mustard on the remaining slices and top each sandwich.