Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
     2/3  cup           butter
   1                    egg yolk
   6      squares       semisweet chocolate -- melted and cooled
   1      tsp.          instant coffee
   1      Tbsp.         rum -- (optional)
   1      cup           chocolate wafer cookies -- crumbled

Preparation:

1. Cream butter until smooth. Blend in egg yolk and sugar. 2. Add chocolate, coffee and rum (if using); mix well. 3. Chill until firm enough to handle (about 3-4 hours). 4. Drop mixture into wafer crumbs, and roll to coat all sides and form a ball. 5. Drizzle with additional chocolate if desired.