Prepare all the ingredients. Pour the milk and heavy cream into a saucepan and heat over medium heat. Do not boil, just warm it through.
In a bowl, whisk the egg yolks with the sugar and vanilla sugar until light and fluffy. Gradually add the warm milk and cream mixture, then pour it back into the saucepan while stirring constantly.
Cook the mixture over low heat, stirring constantly, for 5-7 minutes, or until it thickens slightly. Be careful not to let it boil.
In a small bowl, mix the ground cinnamon with 2 tablespoons of hot water to form a smooth, lump-free paste. Add this paste to the egg mixture and stir well to combine.
Once thoroughly mixed, strain the mixture through a fine-mesh sieve to remove any solids. Pour the mixture into a bowl and let it cool to room temperature.
Refrigerate the mixture for at least 3-4 hours, or preferably overnight, to allow the flavors to meld and the parfait to set properly.
Before serving, garnish the parfait with fresh cinnamon, which adds an extra aroma and flavor to the dessert.
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