Allow to cool until the chocolate no longer feels hot to the touch. Beat the butter in a bowl until soft, then gradually beat in the icing sugar. Add the vanilla extract and beat again.
Blend thoroughly, scraping down the sides occasionally. Once the green has completely disappeared, the icing is done. It should look like thick chocolate frosting.
1 1/2 cups icing sugar 1/2 cup butter 1/2 cup cocoa powder 1 tsp vanilla Milk as required (approx. 1/2 cup) Mix the icing sugar, butter and vanilla in a bowl and beat together to cream it, adding milk ...