Covers a 20cm round cake. Make a smaller batch just for filling.

Ingredients

• 150g unsalted butter, softened at room temperature
• 0.5tsp vanilla extract
• 375g icing sugar
• 75g white/milk chocolate

Method

• Break the chocolate into pieces and melt in a bowl over a saucepan of water.
• Cream the butter, vanilla and sugar together.
• Mix in the melted chocolate and leave to cool.