Coarsely crush the chocolate and melt it on a warm water bath. Finely crumble the biscuits. Add chocolate and rum and mix well. Form approx. 10 balls from the mixture. Roast almond flakes in a pan without fat until golden brown.
Let it cool down. Coat balls with egg white and roll them in almonds, chocolate sprinkles, chocolate flakes or coconut flakes as desired. Place in paper cups.