Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   2      tablespoons   Dijon-style mustard
   2      tablespoons   prepared horseradish
   5      tablespoons   butter -- room temperature
                        salt and pepper to taste
   1      teaspoon      lemon juice

Preparation:

Blend all ingredients together, scrape into a serving bowl. Serve at room temperature for dolloping over fish.