Knead the sifted flour, sugar, nuts, butter, yolks, and lemon zest into a smooth and compact dough.
Wrap it in food folie and let it rest in a fridge for 2 hours minimum, but ideally overnight.
Form a loaf about 2 inches / 5 cm in diameter, and slice it into equally-sized slices.
Form stripes from them, shape them like crescents and bake on a tray lined with baking parchment at 340 °F / 170 °C (preheated oven) for 10-15 minutes. Baked rohlíčky should get light gold.
Take the try with baked crescents out of the oven, let vanilkové rohlíčky rest for 5 minutes, and coat them in vanilla sugar.
Notes
This recipe accounts for about 60-70 crescents.
If you want your vanilkové rohlíčky more fine-grained, you can use ground blanched almonds or simply almond flour.
Don’t knead the dough for rohlíčky too hard, the result should be soft and non-sticky.