Grate the marzipan or cut it into small pieces. Smaller pieces will incorporate more easily into the mixture.
In a bowl, whisk together the egg yolks, brown sugar, and vanilla sugar until light and smooth.
In a small bowl, combine the cinnamon and grated marzipan.
In a large bowl, whip the heavy cream until soft peaks form, being careful not to overwhip it to maintain its light texture.
Gently fold the egg yolk mixture and the cinnamon-marzipan mixture into the whipped cream. Mix carefully to avoid deflating the cream.
Pour the mixture into a suitable container and freeze for at least 4 hours, or until the parfait is firm.
Before serving, garnish the top of the parfait with a little grated marzipan or cinnamon.
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