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 pale and fluffy. Gradually add the warm milk and heavy cream, then pour the mixture 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.
Peel the quinces, cut them into small pieces, and simmer them in a little water for 5-7 minutes, or until softened.
Once the quinces are softened, transfer them to a blender and puree until smooth.
Add the quince puree to the egg mixture and mix well. Once combined, strain the mixture through a fine-mesh sieve to remove any quince pieces. 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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