Prepare the icing: Put 2 tablespoons of water in a small saucepan, when it starts to boil, add the sugar and mix with a spoon until it melts. Then pour 2 tablespoons of liqueur or brandy and broken chocolate pieces - stir until the chocolate melts. Add the butter, let it melt - mix well to blend the composition and remove from the heat. Allow to cool to room temperature.