01 - Combine flour, salt, and powdered sugar in a large mixing bowl. Add cold butter and rub with fingertips until a crumb texture forms. Work in the egg until a homogeneous dough is achieved. Shape into a ball, wrap, and chill for 30 minutes.
02 - Preheat oven to 350°F. Roll out the dough and press into a 9–10 inch tart pan. Prick the base with a fork. Line with parchment and fill with pie weights. Blind bake for 20 minutes. Remove weights and parchment, bake 10 more minutes until lightly golden. Cool completely.
03 - Heat milk with vanilla until just simmering. Whisk yolks with sugar, then stir in cornstarch. Gradually whisk in a little hot milk, then return mixture to saucepan. Cook over medium heat, stirring, until thickened. Remove from heat, whisk in butter. Cool completely, covering the surface to prevent a skin.
04 - Wash, hull, and slice the strawberries as desired.
05 - Spread cooled pastry cream evenly in the tart shell. Arrange strawberries decoratively on top.
06 - Heat apricot preserves with water until fluid, then strain if needed. Brush lightly over arranged strawberries using a pastry brush.
07 - Refrigerate the tart for at least 1 hour before slicing.