In a mixing bowl, combine flour, sugar, and salt. Cut in butter until mixture resembles coarse crumbs. Add egg yolk and mix until dough forms. Press dough into tart pan. Bake for 15 minutes.
In another bowl, whisk together sugar, eggs, lemon juice, and lemon zest. Stir in heavy cream. Pour filling into baked crust.
Bake for 25-30 minutes, or until filling is set. Let cool. Top with fresh raspberries before serving.