01 - In a large mixing bowl, combine all-purpose flour, a pinch of salt, and powdered sugar. Add cold, diced butter and rub with fingertips until the mixture resembles coarse crumbs. Incorporate the egg and gently mix until a homogeneous dough forms. Shape into a ball, cover with plastic wrap, 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 paper and fill with baking weights. Bake for 20 minutes, then remove weights and parchment and bake for an additional 10 minutes until lightly golden. Allow to cool completely.
03 - Heat the whole milk with the split vanilla bean or vanilla extract until steaming. In a separate bowl, whisk egg yolks with granulated sugar until pale, then whisk in cornstarch. Gradually pour in some of the hot milk, stir well, then return the mixture to the saucepan. Cook over medium heat, stirring constantly, until thickened. Off the heat, whisk in butter. Place a layer of plastic wrap directly on the surface and chill.
04 - Wash, hull, and slice the strawberries as desired.
05 - Spread the cooled custard cream inside the tart shell. Artistically arrange the sliced strawberries over the custard.
06 - Gently heat apricot jam with water until liquid. Using a pastry brush, delicately glaze the strawberries to impart shine.
07 - Refrigerate the tart for at least 1 hour before serving.