In a bowl, mix together all the ingredients except oil. Add water and make a thin batter. It should be buttermilk like consistency. Keep aside for 15-20 minutes.
Heat a non-stick tawa / griddle and rub a cut onion on the surface. This ensures easy removal of the dosa.
Pour the dosa batter, little at a time, around the edges first and then fill up the centre. Drizzle some oil around the edges and over it.
Lower the flame and cook the dosa till it is done one one side for 1-2 minutes. Flip it over and cook the other side too. When done, transfer to a serving plate.
Make similar dosas with the remaining batter and serve with coconut chutney and sambar.
