In a bowl, mix the Ragi flour, Rice flour, chopped onion, green chillies, cumin seeds, Curry leaves, curd and salt.
Add enough water to make a runny batter. The batter should be thin like Rava dosa.
Heat a dosa tawa. Once it is hot enough, reduce to medium heat.
Take a ladle full of batter and pour from a height over tawa in circular motion. Fill in the gaps if any. The dosa should be thin.
Drizzle oil around the dosa. Cook the dosa in medium flame.
When the edges started coming off, flip the dosa.
Transfer the dosa to a plate once it is well cooked.
Serve with chutney or sambar or pickle.