|Unsweetened chocolate||2 Ounce|
|Soft butter||1⁄4 Cup (4 tbs)|
|Confectioners sugar||1 Cup (16 tbs)|
Melt chocolate over hot water.
Remove from heat; cool to lukewarm.
Add chocolate, blending well.
Blend in 112 cup of the sugar.
Add egg yolk gradually, creaming well.
Add remaining confectioners' sugar alternately with milk, beating after each addition until smooth.
Blend in vanilla.