In a bowl, combine the egg yolks with the brown sugar and vanilla sugar. Whisk well until light and foamy.
Pour the white wine into a saucepan and bring to a simmer over medium heat. Reduce the heat and cook, stirring constantly, for 1-2 minutes to allow the alcohol to evaporate.
Once the wine has slightly reduced, slowly drizzle it into the egg yolk mixture while whisking continuously. Transfer this mixture to a saucepan and cook over a double boiler (bain-marie), stirring constantly, for about 5 minutes, or until the mixture begins to thicken.
In a large bowl, whip the heavy cream until soft peaks form.
Allow the wine-egg yolk mixture to cool slightly, then gently fold it into the whipped cream, being careful not to deflate the cream.
Pour the mixture into a loaf pan or individual molds and freeze for at least 4 hours, or until the parfait is firm.
Before serving, sprinkle the top of the parfait with a little fresh lemon zest for an extra burst of freshness.
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