In a bowl, crumble together the flour, butter, and powdered sugar. Add the egg yolk and ice water. Knead until a smooth dough forms. TIP: Work quickly to prevent the butter from melting.
Shape the dough into a ball, wrap it in plastic wrap, and refrigerate for 30 minutes.
Meanwhile, in a bowl, combine the blackberries, brown sugar, cornstarch, lemon juice, and vanilla sugar. TIP: Gently mix to avoid crushing the blackberries.
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. TIP: Rolling the dough onto a rolling pin makes it easy to transfer.
Fill the dish with the blackberry filling. Cut strips from the remaining dough and arrange them over the 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: Even better with vanilla ice cream or whipped cream.
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