In a wide bowl add besan flour and 2 cups of water; whisk it well with electric mixer or hand whisk to remove all the lumps
Add all other ingredients mentionedoneby one and mix eveything well
Heat the dosa griddle and add oil to grease. Add 1/3 of water to the batter and mix well. Take around 1/2 cup of water. The batter will spread on its own. Drizzle oil and when you see pores and batter becomes slightly dry flip it. Cook other side and serve with ketchup or green chutney