In a saucepan, combine the sugar and water over medium heat. Cook, stirring constantly, until the sugar caramelizes and turns a deep golden brown.
Once the caramel reaches the desired color, remove from heat. Add the butter and stir until smooth.
In a separate bowl, whisk the egg yolks with the vanilla sugar. Slowly pour the caramel mixture into the egg yolks while whisking constantly. Return the mixture to low heat and cook until the eggs are slightly cooked but do not boil.
Finely grate the marzipan and add it to the caramel mixture. Stir until smooth.
In a bowl, whip the heavy cream until stiff peaks form. Gently fold the marzipan-caramel mixture into the whipped cream.
Pour the mixture into an airtight container and refrigerate for 4-5 hours, or preferably overnight, to set and allow the flavors to meld.
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