Dissolve the yeast in the first batch of lukewarm milk, add the first portion of flour to get a pancake-batter thickness, dust the top with a little flour, and let rise in a warm place for about 20-30 minutes, until puffed up.
Add the 1 liter of flour, the second batch of lukewarm milk, the sugar, the salt and the egg yolks.
Work the dough thoroughly with open fingers.
Once it's nice and smooth, knead in the melted butter little by little, and work it in well.
Cover and let rise in a warm place for about 45-60 minutes, until doubled.
Tear off a piece, place in a buttered baking tin, and let rise again for about 30 minutes.
Brush with beaten egg and bake in a preheated oven (180°C) for about 35-40 minutes.
Based on: Malatinszky Fanny szakácskönyve (a classic Hungarian cookbook), modernised. Calories and protein are estimated.