01 - Combine flour, salt, and powdered sugar in a mixing bowl. Add cold diced butter and rub with fingertips until mixture resembles coarse sand. Incorporate the egg and mix just until dough forms. Shape into a disk, wrap in plastic, and chill for 30 minutes.
02 - Preheat oven to 350°F. Roll dough and line a 9- to 10-inch tart pan. Dock the base with a fork. Cover with parchment, fill with pie weights, and bake for 20 minutes. Remove weights and parchment, bake an additional 10 minutes until lightly golden. Cool completely.
03 - Heat milk with vanilla just to a simmer. Whisk egg yolks and sugar until pale, then whisk in cornstarch. Gradually pour hot milk into yolk mixture, whisking constantly. Return to saucepan and cook over medium heat, stirring until thickened. Off heat, stir in butter. Cover directly with plastic wrap and chill.
04 - Rinse, hull, and slice strawberries as desired.
05 - Spread cooled pastry cream evenly in the tart shell. Arrange strawberries decoratively over the cream.
06 - Heat apricot jam with water until smooth. Brush strawberries gently with glaze for shine. Refrigerate 1 hour before serving.