Beat 150g sugar, egg yolk and vanilla in a bowl on a double boiler for 10 minutes until frothy. Add the cinnamon powder and the grated or chopped marzipan to the mixture. Finally, fold in the whipped cream.
Line a loaf pan with cling film and pour in the creamy mixture. This then has to be in the freezer for at least 4 hours.
Take the parfait out of the freezer 10 minutes before serving and let it thaw.
For the red wine plums:
Caramelize 100 g sugar in a pan and add the drained plums. Stir and deglaze with the red wine. Add the cinnamon stick and cinnamon and simmer the plums on a low heat until the brew has thickened.
Cut the parfait into slices and serve with the plums. Dust with powdered sugar if necessary.