Heat the milk to lukewarm temperature (about 30°C). In a bowl, place yeast (fresh or dry), sugar, 2 tablespoons of flour, and milk. Mix and rub thoroughly until the ingredients are combined. Cover with a cloth and set aside for about 20 minutes in a warm place, e.g., in an oven preheated to 35°C (place in the turned-off oven). After this time, the starter should start to foam and bubble. If the yeast is working properly, proceed to the next steps.
In a bowl, place the rest of the flour, starter, and a bit of water (depending on the need about 1-2 tablespoons, to be able to knead the dough). Mix and knead into a compact and uniform dough. Cover with a cloth and set aside for about 60 minutes in a warm place, e.g., in an oven preheated to 35°C (place in the turned-off oven). About halfway through this time, start preparing the filling.
Cook the lentils (check the recipe on the blog). In the meantime, start preparing the other ingredients.
Wash, dry, and finely chop the mushrooms. Peel the garlic and press through a garlic crusher. Heat oil in a pan. After a moment, add the garlic. Fry for a while, stirring constantly. Then add the mushrooms and fry until soft, about 5-10 minutes. Stir occasionally.
Towards the end, add the lentils. Season to taste with salt and pepper. Mix and fry for a moment. Set aside to cool.
After the indicated time, knead the dough again and roll it out on a lightly floured surface. The dough should have a medium thickness (about 5 mm-1 cm). Cut the dough into rectangles in which you will place and wrap the filling (about 8 x 12 cm). Try to use as much dough as possible – join the remaining scraps, knead briefly and roll out again and cut out. Place the filling in the center of each rectangle.
Roll each piece into a roll and arrange (seam down) on a baking sheet lined with parchment paper. Leave small gaps between each piece. Put in an oven preheated to 180°C for about 20 minutes. Remove when the dough is golden.
Enjoy hot or cold. Store in an airtight container in the refrigerator for up to 2-3 days.