In a bowl, crumble together the flour, butter, and powdered sugar. Add the egg yolk and cold water, and knead until you have a smooth dough. TIP: Work quickly to prevent the butter from melting.
Shape the dough into a ball, wrap it in plastic wrap, and chill in the refrigerator for 30 minutes.
Meanwhile, prepare the poppy seed filling: in a saucepan, heat the milk, then add the sugar, vanilla sugar, and grated lemon zest. Stir in the ground poppy seeds. TIP: Do not boil; just gently heat the ingredients together.
Preheat the oven to 350°F (180°C) and grease a pie dish.
Roll out two-thirds of the dough and line the pie dish with it. TIP: Rolling the dough onto a rolling pin makes it easy to transfer.
Fill the dish with the poppy seed filling. Cut the remaining dough into strips and arrange them on top in a lattice pattern.
Bake the pie for 35-40 minutes, or until golden brown. TIP: If the edges brown too quickly, cover them with aluminum foil.
Let the pie cool, then slice and serve. TIP: Dusting with powdered sugar makes it even more delicious.
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