Bake both pieces of the puff pastry. They should be spread out as much as they can.
Let’s make the pudding!
Take about 1/3 milk and mix it with cornstarch and egg yolk.
Mix the rest of the milk with the sugar and heat it up.
Mix the cornstarch texture with the milk and sugar. Don’t stop heating it up and stir it very properly. It hardens pretty quickly, so keep mixing it.
Let the mixture cool down for a moment. Whip egg whites with vanilla sugar and add it gently to the pudding mixture.
Brush one baked puff pastry with the pudding. Put the other pastry on it.
Bon apetit! Dobrou chuť!