2 cups (300 gm) whole wheat flour (atta)
1 cup water
Some dry flour to help in rolling an iron griddle (tawa)
Knead flour and enough water into a smooth and soft dough (enough to press a finger into it without much pressure).
Flatten, make impressions with your finger tips, and sprinkle some water. Let it rest, thus, for about 30 minutes, at least.
Knead a little again, roll pieces of dough into smooth balls, flatten and roll into rounds about 1/8" thick (will take some practice).
Place the tawa over the fire, and heat over high heat till a drop of water thrown over it, evaporates immediately with a sizzling sound.
Place a chapatti over the tawa and as soon as the edges start rising lift it with a pair of and place over a direct flame, with the uncooked side down. It will puff up immediately.
Flip it over to cook the other side a little more and your chapatti is ready.