01 - In a large mixing bowl, combine flour, salt, and powdered sugar. Add cold butter and rub with fingertips until mixture resembles fine crumbs. Incorporate the egg and blend 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 dough and line a 9 to 10-inch tart pan. Prick base with a fork, cover with parchment paper and baking weights. Blind bake for 20 minutes, remove weights, and bake 10 minutes more until lightly golden. Let cool completely.
03 - Heat whole milk with vanilla bean (or extract) almost to a simmer. In a bowl, whisk egg yolks with granulated sugar, then add cornstarch. Temper with a bit of hot milk, mix well, then return to saucepan. Cook over medium heat, stirring constantly, until thickened. Remove from heat and incorporate butter. Cover directly with plastic film and chill until cooled.
04 - Wash, hull, and slice strawberries as desired.
05 - Spread cooled pastry cream onto the baked crust. Arrange strawberries evenly on top.
06 - Warm apricot jam with water. Brush gently over strawberries for a glossy finish.
07 - Refrigerate assembled tart for 1 hour before slicing and serving.