Take wheat flour in a bowl. Add salt, baking soda and baking powder. Mix with your fingertips.
Now start adding little milk at a time and keep kneading the dough.
Make smooth and soft dough.
Cover it with the damp kitchen towel or damp paper towel
and let it rest for 30-45 minutes.
Making Tandoori Roti on Tawa:
After the resting time, knead the dough again two three times to make it smooth.
Divide it into 6 equal portions and make smooth balls. Then flatten each ball between your palm and make disc.
Work with one disc at at time and roll into 6 inch diameter circle.
Heat the cast iron tawa on a medium-high. It should be nice and hot.
Once hot place the rolled roti and cook for few seconds. You will notice the bubbles on top surface.
Once the bottom surface has brown spots, remove the tawa from the stove and put the rack. LOWER the gas heat and roast the uncooked surface of roti directly on the flame. It will puff up. Keep moving using the tongs for even browning.
Once cooked from other side, remove it from the rack to plate.
Now place the tawa back on the stove and continue with rest of the rotis.
Apply ghee or butter on the hot/warm roti before serving.