In a small bowl mix 20 g of yeast with 1 teaspoon of sugar and 250 g of lukewarm water. Set aside until it starts to foam and bubble up about 20 minutes.
In other bowl put together teaspoon of salt, 1/2 kg of flour and yeast mixture. Mix it well and make a firm dough as for bread and leave it to grow about an hour. Than make 2 or 3 balls of it ( if you wish smaller or bigger lepinje ) and stretch each ball to a thickness of one centimeter. Put bread in 250 degree hot pen for baking and bake it for 15 minutes.