Mix dry yeast with warm milk. In a bowl, add flour, butter, yolks, warm milk mixture, sugar, salt, vanilla essence, lemon zest and knead very well.
2
After kneading, put the dough for 30min inside the fridge.
3
Meanwhile make the walnuts filling, in a pot put milk, sugar and raisins to slightly boil, add finely crushed walnuts, vanilla essence, lemon zest and let it cool down.
4
Divide the dough, roll it rectangle 2-3mm thin and put the filling on the top then roll it. After making a roll, brush one egg YOLK on surface then put it in the fridge for 10min.
5
After 10min, brush egg WHITE on the surface and again let it in the fridge for another 10min. This procedure makes crack on surface of beigli. Bake it for 30-40min at 180C.