01 - In a food processor, pulse flour, powdered sugar, and salt until combined. Add butter and pulse until the mixture resembles coarse crumbs. Add egg yolk and 2 tbsp cold water; pulse until dough just comes together. Add another tbsp water if needed. Turn dough onto plastic wrap, form into a disk, wrap, and chill for 30 minutes.
02 - Preheat oven to 350°F.
03 - Roll out the dough on a lightly floured surface to fit a 9-inch tart pan. Press into the pan, trim excess, and prick the base with a fork.
04 - Line the crust with parchment and fill with pie weights or dried beans. Bake for 15 minutes, remove weights and parchment, then bake 5 minutes more until lightly golden. Cool completely.
05 - Place chopped chocolate in a heatproof bowl. Heat heavy cream in a saucepan until just simmering, then pour over chocolate. Let sit 2 minutes. Add butter, vanilla, and salt, then whisk until smooth and glossy.
06 - Pour ganache into cooled tart shell, smoothing the top. Chill in the refrigerator for at least 1 hour until set.
07 - Arrange fresh raspberries decoratively over the ganache. For a shiny finish, gently warm raspberry jam and brush over the berries.