Beat whites until foamy. Gredually add sugar and beat until stiff. In a blender place the chocolate bits and grate finely. Add boiling water and stir until melted. Add the egg yolks to the blender and the frangelica liquor. Blend until smooth. Gently fold the chocolate mixture into the beaten egg whites. Spoon into 6 dessert dishes and chill until set. Drizzle with frangelica. Serve with whipped cream and one hazel nut.