01 - Combine flour, sugar, and salt in a bowl. Cut in cold butter until mixture resembles coarse crumbs. Stir in egg yolk and cold water until dough forms. Shape into disk, wrap, and chill 30 minutes.
02 - Preheat oven to 350°F. Roll dough on floured surface to fit 9-inch tart pan. Fit dough into pan, trim edges. Prick bottom with fork, line with parchment and pie weights. Bake 15 minutes, remove weights and parchment, bake 10 more minutes until golden. Cool completely.
03 - Heat milk in saucepan until simmering. Whisk sugar, egg yolks, and cornstarch until smooth. Gradually add hot milk, whisking constantly. Return to saucepan, cook over medium heat, whisk until thickened (2–3 minutes). Remove from heat, stir in vanilla and butter. Cover surface with plastic wrap and chill until cold.
04 - Spread chilled pastry cream evenly in tart shell. Arrange raspberries in concentric circles over cream.
05 - Warm apricot jam with water until melted. Brush glaze gently over raspberries for shine.
06 - Refrigerate tart for at least 1 hour to set prior to serving.