Dissolve the yeast in lukewarm milk with one teaspoon of sugar, and let it stand for 5-10 minutes until foamy.
In a large bowl, combine the flour and salt, then rub in the butter until it resembles coarse crumbs.
Add the proofed yeast, sugar, and egg yolks. Knead until you have a smooth dough.
Divide the dough into two portions, shape them into balls, wrap them in plastic wrap, and refrigerate for 1 hour.
Meanwhile, prepare the filling: bring the milk to a boil, then stir in the ground poppy seeds, sugar, vanilla sugar, and lemon zest.
Let the poppy seed filling cool completely, making it easier to spread.
Roll out the dough into a rectangle, then evenly spread the filling over it.
Tightly roll up the dough like a Swiss roll and place it on a baking sheet lined with parchment paper.
Brush the top of the roll with egg yolk and let it rest for 30 minutes.
Bake in a preheated oven at 350°F (180°C) for 35-40 minutes, or until golden brown.
To provide the best experiences, we and our partners use technologies like cookies to store and/or access device information. Consenting to these technologies will allow us and our partners to process personal data such as browsing behavior or unique IDs on this site and show (non-) personalized ads. Not consenting or withdrawing consent, may adversely affect certain features and functions.
Click below to consent to the above or make granular choices. Your choices will be applied to this site only. You can change your settings at any time, including withdrawing your consent, by using the toggles on the Cookie Policy, or by clicking on the manage consent button at the bottom of the screen.