In a mixing bowl, add semolina. Now In a mixture jar, add poha and grind into a coarse powder.
Then add poha powder into semolina. Also, add curd and salt.
Now add water gradually and make it medium thick and pour the batter. Do not add more water to the idli batter.
Then whisk it for 2 minutes so air particles incorporate in it and it becomes light and fluffy.
cover and rest the batter for 20 minutes.
Now in a tadka pan, add oil, mustard seeds, chana dal, urad dal, chopped curry leaves, and asafetida. Sauté till dal turns slightly golden brown.
Switch off the gas and add tadka into the idli batter. also, add coriander leaves and mix well.
Now add baking soda and lemon juice. mix well.
Instant rava idli batter is ready.