Combine egg, sugar and salt with a whisk.
Mix in melted butter, warm milk and water.
Add in flour and yeast. Knead until a dough forms.
Cover and let rise, 1-2 hours.
Divide into equal pieces, approximately 80 g each.
Roll out and spread a thin layer of soft butter followed by some sugar.
Roll up and cut & form the buns like shown on the video.
Cover and let rise 30 mins.
Brush with egg wash.
Bake at 350 F for 30 mins.