Prepare all the ingredients. Pour the milk and 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 pale and fluffy. Gradually add the warm milk and cream mixture, then pour everything back into the saucepan while whisking continuously.
Cook the mixture over low heat for 5-7 minutes, stirring constantly, until it slightly thickens. Be careful not to let it boil.
Toast the poppy seeds in a dry skillet for a few minutes, until fragrant. Add them to the egg yolk mixture.
Once well combined, strain the mixture through a fine-mesh sieve to remove any poppy seed fragments. 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.
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