You will require the batter for it. Add half teaspoon salt in it and lightly stir it.
Heat up the flat non stick tawa or iron tawa on medium flame.
Clean the tawa with half onion or wet thick cloth to lower down the temperature of it.
Spread the oil on iron tawa for making it greasy. Remember that oil should not be visible on it. But tawa looks greasy. There is no need to add oil on non stick tawa.
Spread the batter with the help of spoon on tawa. And make sure the flame is low.
Spread batter in circular direction on tawa.
Spread the oil on top and on all sides of the dosa.
Cook dosa now on high flame for 1/2 to 2 minutes.
You will see, the edges of dosa will lose the tawa itself.
Cook it until it becomes crisp and golden brown.
Now fold the dosa. And your yummy crispy plain dosa is ready to eat.