Place dark chocolate in a bowl and melt it in the microwave oven for 1 minute.
Take it out and whisk. Add 2 tbsps condensed milk and mix.Crumble ¾ of the cake and add to the chocolate mixture.
Coarsely grind walnuts and almonds and add. Melt white chocolate in a bowl in the microwave oven for 1 minute.
Mix the ingredients in the bowl and shape into walnut sized balls and arrange them on a plate.
Add 2 tbsps condensed milk to the melted white chocolate and mix well.
(You can also add fresh cream instead of condensed milk).
Put this mixture into a butter paper cone and pipe over the chocolate balls making different designs.
Chill in a refrigerator and serve.