Preheat the oven to 180C. Grease and flour a non-stick 12 hole friand tin. Mix together the ground hazelnuts, icing sugar and flour. Stir in the egg whites until just combined. Stir in the melted butter.
Pour the batter into the tins. Arrange the berries on top of each friand.
Bake for 25-30 mins or until pale and golden. The friands should spring back when touched. Remove from the oven onto a wire rack to cool. Dust with extra icing sugar and stir in an airtight container.