Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
  24                    mushrooms -- 2" in diameter
   3      tablespoons   butter -- melted
  24                    littleneck clams -- shucked
   5      tablespoons   horseradish
   8      tablespoons   mayonnaise
   1      teaspoon      worcestershire sauce
   6      drops         tabasco

Preparation:

Remove stems from mushrooms and reserve for another use. Wipe mushroom caps with a towel, dip in butter, and place, rounded side down, on a rack on a cookie sheet. Place 1 clam in each mushroom cap. Mix together remaining ingredients and spoon over clams. Broil about 6" from heat for about 8 minutes or until mushrooms are tender and topping begins to brown.