Activate the yeast in the lukewarm milk with a little sugar.
Add the flour, sugar, eggs, salt and soft butter and knead into a smooth dough.
Cover and leave to rise in a warm place for 1.5 hours until doubled.
Shape into small balls, put them on a baking tray and leave to rise for another 30-40 minutes.
Fry in hot oil until golden on both sides, then roll in sugar while still warm.
Meanwhile, for the custard, bring the milk to the boil with the vanilla, mix the egg yolks with the sugar and cornflour until smooth, then cook together into a thick custard.
Cut or pierce the cooled doughnuts from the side and pipe in the vanilla custard.
A Receptnaptár original recipe. Calories and protein are estimated.