Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   1      pound         unsalted butter
     1/2  pound         shrimp shells

Preparation:

Combine ingredients in a food processor process to a fine puree, scraping sides often. Force through a fine sieve to remove shells. Form into a 1-inch diameter log. Wrap in plastic chill until firm cut into 1/4-inch slices to serve