In an mixing bowl, Mix wheat flour, rice flour, rava, curd and salt to taste.
Add water little at a time and mix well to a lump free batter.
Further add chopped onions, chopped green chilli, chopped ginger, curry leaves, peppercorns, cumin seeds and chopped coriander leaves.
Mix well. add water if needed to make it very thin batter.
Heat Dosa tawa and make dosa by pouring a ladleful of batter quickly.
grease with oil all over. let it cook for a couple of minutes until brown.
flip sides and cook the other side for half a minute.
serve the dosa hot with chutney of your choice.