Grate the dried cake remains and sprinkle with the rum. Melt the butter, couverture and dark chocolate over a water bath. Add the ground and chopped nuts with the icing sugar to the cake crumbs and mix. Add the melted butter - chocolate mass to the cake mass and mix everything well.
Now form a ball of about 3-4 cm in size (or smaller, as you like) and wilt in the chocolate sprinkles or coconut flakes. Put the balls in a cool place and let them cool down.
My tip: for children I assume from rum oranges or vanilla aroma. The orange balls taste also very delicious and not only for children.