Strain the lentils, rice, and poha.
Next, take a blender and transfer the urad dal, methi, and ¾ cup of the strained water of the urad dal.
Blend them into a fine and smooth batter. Add a bit of water if needed. We don’t want the mixture to be extremely thick.
Transfer them into a bowl and keep them aside.
Next, transfer the parboiled rice or idli rice along with the poha into the blender.
Add ¾ cup of strained water into the blender and blend the rice into a smooth batter.
Now, take a large mixing bowl and transfer the rice batter into it.
To this, add the dal batter and combine well.
Fold in and mix from all the sides and the bottom so that they blend in well. It is better if you mix them with your clean hands.
The consistency should be thick but pourable.
Cover the mixing bowl and let the batter rest for at least 8-10 hours. This will ferment the batter which will be perfect to make idli.