01 - Combine flour, sugar, and salt in a bowl. Cut in cold butter until mixture resembles coarse crumbs. Add egg yolk and 1–2 tbsp cold water, mixing just until dough forms. Flatten into a disk, wrap, and refrigerate for 30 minutes.
02 - Roll dough on lightly floured surface to fit a 9-inch tart pan. Press dough into pan, trim excess, and prick base with fork.
03 - Freeze crust for 10 minutes. Preheat oven to 375°F. Line with parchment paper, fill with pie weights, and bake for 15 minutes. Remove weights and paper, then bake 5 minutes more until golden. Cool completely.
04 - Heat heavy cream in small saucepan until just simmering. Pour over chopped chocolate in a bowl. Let sit 1 minute, add butter, and stir until smooth and glossy.
05 - Pour ganache into cooled crust. Smooth top and chill for 45–60 minutes until set but still slightly soft.
06 - Arrange fresh raspberries over ganache. For glossy finish, warm raspberry jam with water and gently brush over berries.
07 - Serve chilled or at room temperature.