What you will need:

Riceflour-1 cup
Rava or sooji- 1/2 cup ( or 3/4 cup for more crispy dosas)
Maida- 1/4 cup
Salt to taste

For seasoning

Mustard seeds- 1 tsp
Cumin seeds - 1 tsp
Green chillie-1 chopped finely
Curry leaves- a few
Ginger- a small piece finely chopped
Coriander leaves- a few finely chopped
Onion- 1 cup finely chopped
Oil / ghee - 2 tsp
Butter - 2 tsp

How to prepare:

Mix the rice flour, maida and rava. Add salt, chopped green chillies, chopped ginger and coriander leaves. Add water or buttermilk and make sure that the batter is of a very watery consistency . Heat 1 tsp of oil in a pan and add cumin seeds and mustard seeds, when it splutters add curry leaves and then the onion.Fry the onion until it turns transparent. Allow it to cool for a couple of minutes and then pour it over the batter.
Heat the griddle and grease it with oil/ghee. Take one ladleful of batter and pour it on the tawa. This dosa cannot be spread like normal dosas. Put some butter on top. Cover and cook. After the first side is cooked and is golden brown in color, fold the dosa and remove it from the griddle. This dosa is only fried on one side.
Serve hot with coriander chutney or hing chutney.