Make the dough by mixing the flour, butter, and milk until smooth, then let it rest in the refrigerator while you prepare the filling and preheat the oven.
For the filling, beat the egg yolks with the sugar until pale and fluffy. Add the ground walnuts and rum, mixing with a spoon. Finally, gently fold in the stiff-whipped egg whites.
Roll out half of the dough into a sheet and place it in your baking pan. Spoon the filling over it and spread it evenly. Roll out the second half of the dough, place it on top, and prick it all over with a fork.
Bake at 180°C for about 30 minutes, or until the top is lightly golden and the filling passes the toothpick test — it should come out dry.
Let the cake cool completely, then cut it into rectangles and dust generously with powdered sugar.


















