01 - Blend flour, salt, and powdered sugar in a mixing bowl. Rub in the cold butter by hand until the texture resembles coarse crumbs. Add the egg and mix just until the dough comes together. Shape into a ball, wrap in plastic, and refrigerate for 30 minutes.
02 - Preheat oven to 350°F. Roll out the pastry on a floured surface. Line a 9–10 inch tart pan with dough. Dock the base with a fork, cover with parchment and pie weights. Bake for 20 minutes, remove weights, and bake another 10 minutes until golden. Cool completely.
03 - Heat milk and vanilla to a simmer. In a separate bowl, whisk egg yolks with sugar, then add cornstarch. Gradually whisk in some hot milk. Return the mixture to the saucepan. Cook over medium heat, stirring constantly, until thickened. Off the heat, stir in butter. Cool with plastic wrap pressed to the surface.
04 - Rinse, hull, and slice the strawberries as desired.
05 - Spread the cooled pastry cream in the baked tart shell. Arrange the strawberries attractively on top.
06 - Gently heat apricot jam with water until melted, then strain. Lightly brush the strawberries with the glaze using a pastry brush for a glossy finish.
07 - Refrigerate the tart for at least 1 hour before slicing and serving.