Soak gelatine in cold water. Whip the cream until stiff. Separate eggs. Beat egg whites until stiff. Whip egg yolk and sugar to a thick, creamy mixture. Stir in liqueur and cinnamon.
Squeeze out the gelatine and dissolve at low heat. Stir into the egg liqueur mixture, chill and allow to thicken slightly. Fold in cream, beaten egg white and Amarettini (keep approx. 20 g). Pour the cream into a bowl and let it cool in the fridge for about 2 hours. Use a stencil to dust cinnamon stars on the surface. Decorate with crumbled amarettini and possibly lemon balm leaves