Method
Preparation
Preheat your oven to 350°F (175°C).
Mix together the flour, cocoa powder, and powdered sugar in a mixing bowl.
Combine the cold, cubed butter with the dry mixture until it resembles coarse crumbs.
Add the egg yolk and blend. If too dry, incorporate cold water as needed.
Press the dough into a 9-inch tart pan, prick the bottom with a fork.
Bake for 15-20 minutes until set, then let cool completely.
Filling Assembly
Whip the heavy cream in a bowl until soft peaks form.
Combine the mascarpone cheese and vanilla extract, then fold in the whipped cream.
Dip each ladyfinger quickly into brewed coffee and coffee liqueur, then layer in crust.
Spread half of the mascarpone filling over the ladyfingers, then repeat layers.
Cover with plastic wrap and refrigerate for at least 2 hours.
Dust with cocoa powder before serving, garnish with chocolate shavings and coffee beans.
Slice and serve chilled.
Notes
Ensure butter is cold for a flaky crust. Refrigerate for at least two hours before serving to let flavors meld.