01 - Combine flour, salt, and powdered sugar in a large mixing bowl. Incorporate cold butter using fingertips until the mixture resembles coarse crumbs. Add the egg and blend until a smooth dough forms. Shape into a ball, cover with plastic wrap, and chill for 30 minutes.
02 - Preheat oven to 350°F. Roll out the dough and line a 9 to 10-inch tart pan, trimming edges. Prick base with a fork, cover with parchment paper, and fill with pie weights. Bake for 20 minutes, remove weights and parchment, then bake an additional 10 minutes until golden. Set aside to cool completely.
03 - Heat milk with vanilla bean (split and scraped) or vanilla extract until steaming, not boiling. In a bowl, whisk egg yolks with sugar. Add cornstarch and mix until smooth. Gradually add hot milk, whisking constantly, then return mixture to saucepan. Cook over medium heat, stirring until thickened. Remove from heat and fold in butter. Press plastic wrap directly onto cream surface and cool completely.
04 - Wash, hull, and slice strawberries as desired.
05 - Spread cooled pastry cream evenly in the baked tart shell. Arrange strawberries in a decorative pattern atop the cream.
06 - Warm apricot jam with water until smooth. Brush glaze gently over strawberries for a glossy finish.
07 - Refrigerate assembled tart for at least 1 hour prior to serving to allow flavors to develop.