In a mixing bowl, add ragi flour, rice flour and salt. Whisk everything with a balloon whisk.
Add the curd to the mixing bowl and mix well.
Add 3/4 cup of water and whisk well to form a smooth batter.
Now, add rest of the water (1/2 cup) and mix to form a thin dosa batter.
Add onions, ginger, green chili, cumin, black pepper and coriander leaves to the batter and mix well.
Heat a dosa tawa. Splash some water on it. If the water sizzles, then it is in the correct temperature. Proceed to the next step.
Apply some oil on the tawa and ensure that the flame is on medium heat.
Mix the batter well before preparing the dosa. Pour a ladle full of the ragi batter on the tawa in a circular motion from the outside to the inner circle. Smear some oil or ghee on the outer edges and let it cook till the bottom is crisp.
Now, flip the dosa and cook the other side too. Smear some more oil if you want to.
Fold the dosa in two and serve hot with coconut chutney.