01 - Combine the flour, salt, and confectioners' sugar in a bowl. Add cold butter and rub lightly with fingertips until the mixture resembles fine crumbs. Add the egg and mix until a uniform dough forms. Shape into a ball, wrap in plastic, and refrigerate for 30 minutes.
02 - Preheat oven to 350°F. Roll the dough out and line a 9–10 inch tart pan. Prick the base with a fork. Cover with parchment and fill with pie weights. Bake for 20 minutes, remove weights, then bake for another 10 minutes until lightly golden. Cool completely.
03 - Heat the milk with vanilla to just under a boil. Whisk yolks with sugar, then add cornstarch. Slowly stir in some hot milk, return all to the saucepan, cook over medium heat, whisking until thickened. Remove from heat, stir in butter. Cover directly with plastic wrap and cool.
04 - Wash, hull, and slice the strawberries as desired.
05 - Spread cooled pastry cream in pastry shell. Arrange the strawberries decoratively over the cream.
06 - Warm the apricot jam with water. Brush gently over the strawberries to create a glossy finish.
07 - Refrigerate the assembled tart for at least 1 hour before slicing and serving.