Wash rice until the water runs clear.
Soak with water enough to cover the rice well. Cover with lid and keep it aside.
Similarly, wash urad dal with enough water until the water runs clear.
Soak and keep the dal covered. Both Rice and Urad dal have to be soaked for 6 hours.
After 2 hours, wash poha well and soak in water.
Similarly, wash sago well and soaked in water.
Both Poha and Sago have to be soaked for 4 hours separately.
When you are ready to grind, start with urad.
Drain the water completely and grind the urad to a very smooth batter.
Remove to a bowl, add drained rice, and grind to a smooth batter.
Remove to a bow. Now add drained poha and pulse for a couple of rounds until smooth.
Similarly, grind the sago as well.
Now mix all the batter together and grind once again to mix everything together.
Remove to a bowl, add salt, and beat it well.
Cover it with a lid and let it ferment overnight or for at least 8 hours.
If you are going to steam Idlis next morning, you can grease the Idli plates and fill them to 3/4 size.
Fill the steamer filled with water, and bring to a boil.
Now keep the filled plates inside, cover and steam for 15 minutes.
Serve with side dishes of your choice.