01 - In a large bowl, combine flour, salt, and confectioners’ sugar. Add the cold butter and blend with fingertips until the mixture resembles fine crumbs. Incorporate the egg and mix just until a cohesive dough forms. Shape into a ball, wrap in plastic, and refrigerate for 30 minutes.
02 - Preheat oven to 350°F. Roll out the chilled dough and line a 9–10 inch tart pan. Prick the base with a fork, cover with parchment and pie weights. Bake blind for 20 minutes, remove weights, and bake another 10 minutes until golden. Allow to cool completely.
03 - Heat milk and vanilla until it steams but does not boil. Whisk egg yolks with sugar until pale, then mix in cornstarch. Gradually add some hot milk to temper the mixture, then pour everything back into the saucepan. Cook over medium heat, whisking steadily, until thickened. Remove from heat and whisk in butter. Cover directly with plastic and cool.
04 - Wash, hull, and slice the strawberries as desired.
05 - Spread the cooled pastry cream evenly in the baked shell. Arrange the strawberries decoratively on top.
06 - Gently heat apricot jam with water until melted. Brush gently over the strawberries to glaze.
07 - Refrigerate the assembled tart for at least 1 hour before serving.