01 - Pulse flour, sugar, and salt in a food processor. Add cold cubed butter and pulse until mixture resembles coarse crumbs. Add egg yolk and 1 tablespoon cold water, pulsing until dough forms a ball. Add additional water only if necessary. Shape dough into a disc, wrap tightly in plastic, and refrigerate for minimum 30 minutes.
02 - Roll chilled dough on lightly floured surface to 1/8-inch thickness. Press dough into a 9-inch tart pan, trimming excess from edges. Prick bottom surface thoroughly with fork. Refrigerate for 15 minutes while preheating oven to 375°F.
03 - Line chilled crust with parchment paper and fill with pie weights or dried beans. Bake for 15 minutes until set. Remove weights and parchment, then continue baking for 8-10 minutes until golden brown. Cool completely in pan before filling.
04 - Heat whole milk in saucepan until just simmering. Meanwhile, whisk egg yolks, sugar, and cornstarch in a heat-proof bowl until mixture becomes pale and thick, approximately 2 minutes.
05 - Slowly stream hot milk into egg yolk mixture while whisking continuously. Return combined mixture to saucepan and cook over medium heat, whisking constantly, until mixture thickens and bubbles for 2 minutes. Remove from heat and stir in butter and vanilla extract until fully incorporated.
06 - Transfer pastry cream to clean bowl. Press plastic wrap directly onto surface to prevent skin formation. Refrigerate until completely cold, minimum 1 hour.
07 - Spread chilled pastry cream evenly into cooled tart crust. Arrange fresh fruit in decorative pattern on top of cream. Warm apricot jam with water until liquid, then strain through fine mesh sieve. Brush glaze generously over fruit to create glossy finish.
08 - Refrigerate assembled tart for minimum 30 minutes before serving to allow flavors to meld and cream to set completely. Serve chilled.