6 oz Semi-sweet chocolate coarsel
3    Egg yolks
2/3 c  Icing sugar
1/3 c  Coca-cola
1 c  Unsalted butter, softened
2 tb Unsalted butter, softened

Place chocolate & cola in a sm saucepan and cook over low heat, stirring
constantly until smooth. Remove from heat & let stand to cool. Refrigerate
until cold. Beat butter til its light & fluffy.
Beat in egg yolks, one at a time. Gradually add chocolate mixture.
Beat in icing sugar.
Hmmm… raw egg yolks are a little dangerous these days… but I believe
they can be replaced with a substitute available in cake-baking outlets.