01 - Combine flour, salt, and powdered sugar in a mixing bowl. Add butter and rub in with fingertips until mixture resembles coarse crumbs. Mix in the egg until dough forms. Shape into a ball, wrap in plastic, and refrigerate for 30 minutes.
02 - Preheat oven to 350°F. Roll out dough and line a 9–10 inch tart pan. Prick the base with a fork, cover with parchment and pie weights. Bake for 20 minutes, remove weights, and bake 10 minutes more until lightly golden. Cool completely.
03 - Heat milk with vanilla until just simmering. In another bowl, whisk egg yolks with sugar, then whisk in cornstarch. Gradually add a little hot milk to the yolks, whisking constantly. Return mixture to the saucepan and cook over medium heat, stirring until thickened. Remove from heat, stir in butter, and cover with plastic wrap pressed directly onto the surface; cool completely.
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 jam with water until smooth. Gently brush the strawberries with the glaze for a shiny finish.
07 - Refrigerate the tart for 1 hour before slicing and serving.