Prepare the Yeast Mixture: Start by dissolving 1 small spoon of sugar in 200 ml of lukewarm water. Add dry yeast and mix until combined.
Let it Rest: Sprinkle a cup of flour into the mixture, cover the bowl, and let it rest for 15-20 minutes until the yeast activates.
Add Water and Flour: Pour another cup of lukewarm water into the mixture. Gradually add 3 more cups of flour and salt. Mix until a compact dough forms.
Allow Rising: Cover the dough and let it double in size in a warm place for about 90 minutes.
Transfer and Knead: Transfer the dough onto a floured surface and knead briefly by hand.
Shape the Dough: Divide the dough into two parts and form each into an elliptical shape.
Prepare Coating: Mix flour with cold water and boiled water until liquid. Add egg yolk and combine.
Indent the Dough: Create indentations in the dough using fingers, then coat with the yolk mixture.
Bake: Preheat the oven to 250 degrees Celsius. Bake the bread for 15 minutes on the upper rack with a pot of boiling water underneath.