For roasting roti, preheat tawa. Place the roti on heated tawa and cook on medium flame. When roti turns brown from beneath, flip the side. Make small peaks with help of your thumb and finger on the roasted side of your roti. Make peaks on the entire roti. Keep the flame to minimum. Roast until roti gets brown spots on the other side. Now flip the roti and cook from side with peaks for another 2 minutes.