Pastry: Sift the flour, confectioners' sugar, and
salt into a large bowl.
Use a pastry blender to cut in the butter until the
mixture resembles coarse crumbs.
Stir in the hazelnuts and vanilla.
Mix in enough of the beaten egg yolk to make a stiff
dough.
Shape the dough into a ball, wrap in plastic wrap,
and refrigerate for 30 minutes.
Raspberry Filling: Cook the raspberries with the
sugar in a medium saucepan until the fruit has
softened and resembles jam.
Preheat the oven to 400°F/200°C/gas 6. Set out a
12-inch (30-cm) spring form pan.
Roll the dough out to a 1/4 inch (5 mm) thick. Fit
into the pan, trimming the edges if needed. Line the
pastry with waxed paper and fill with dried beans or
pie weights. Prick all over with a fork, pinching
the edges.
Bake for 20 minutes, then remove the paper with the
beans or weights.
Spoon in the raspberry filling. Decorate with the
raspberries.
Dust with the confectioners' sugar and serve.