Activate the yeast in the lukewarm milk with a pinch of sugar.
Add the flour, sugar, salt, eggs and soft butter and knead into a smooth, elastic dough.
Cover and leave to rise in a warm place for 1 hour.
Shape the cold butter into a flat rectangle, wrap it in the rolled-out dough, then fold three times, resting it in the fridge for 30 minutes between folds.
Roll the dough out thinly, cut it into triangles, put a little jam or custard at the base of each and roll up towards the tip.
Put them on a baking tray, leave to rise for 45 minutes and brush with egg.
Bake at 200 °C for 15-18 minutes until golden.
A Receptnaptár original recipe. Calories and protein are estimated.