soak 1 cup of poha in curd for 10 - 15 mins or till they turn soft. (rinse the poha with water if it is not clean)
now mash them nicely using back of your spoon.
now add 1.5 cup of rice rava, 1 cup curd and water as required.
mix and allow to rest for 10 - 15 mins. rice rava (idli rava) has to absorb all the water.
add water to get idli bater consistency.
finally add some salt to taste. just before steaming add a pinch of baking soda and mix well till it turns frothy.
brush the plates with oil and pour the batter immediately into the idli plate. do not rest the batter.
as other idlis you have to steam it for 8-10 mins on medium flame. allow it to rest for 5 mins then unmould.
serve hot with any chutney of your choice.