Soak gelatine in cold water. Put the biscuits in a freezer bag and crumble them finely with the cake roll.
Warm up the milk. Dice marzipan and dissolve in the warm milk while stirring. Squeeze the gelatine and dissolve in the mixture. Leave to cool down a little. Stir in egg yolk and orange peel. Let the marzipan mixture cool down.
Whip the cream until stiff and fold in carefully. Layer cream and cookie crumbs alternately in a bowl. Chill for at least 3 hours.
Form the cream into balls or cams with an ice-cream scoop or with 2 spoons. Cut kumquats into slices. Decorate the cream with chocolate bars and kumquats.