After After 15 minutes, knead the dough for a couple of minutes.Take a small lemon-sized ball of dough. If you need, you can dust the dough with some flour. Do not add too much flour when rolling. Add only enough flour which will help in rolling. If there is a lot of flour covering the rotis, then the rotis will become hard.Roll to thin and slightly transparent rotis. Also roll evenly and keep edges thin.