01 - Combine flour, sugar, and salt in a bowl. Cut in butter until mixture resembles coarse crumbs. Add egg yolk and 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 and trim excess. Prick base with fork.
03 - Freeze crust for 10 minutes. Preheat oven to 375°F. Line crust with parchment paper and fill with pie weights. Bake for 15 minutes, remove weights and paper, then bake 5 more minutes until golden. Cool completely.
04 - Heat cream in small saucepan until just simmering. Pour over chopped chocolate in a bowl. Let sit 1 minute, then 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 raspberries over ganache. For glossy finish, warm raspberry jam with water and gently brush over berries. Serve chilled or at room temperature.