How to make
Combine the butter with the flour until you get a crumbly dough. Add the egg yolks, sugar, vanilla, lemon zest and ground walnuts and knead a smooth dough. Cover with plastic wrap and leave in the fridge for 2 hours.
Then divide the dough into several parts. Roll out each one into a sheet and cut out an even number of stars using cookie cutters.
In the middle of half of them, cut out a circle. Bake the sweets in a preheated 360°F (180 °C) oven for about 10 min.
Smear all of the sweets with jam and stick those with the cut out circle on top. Sprinkle the ready sweets with powdered sugar.
