Take sooji and yogurt in a bowl and mix well. Add salt and mix into a thick batter. Set aside for 15 mins.
After 15 mins the batter will be very thick. Now add in water to reach the perfect thick consistency like idli batter.
Make seasoning, by heating some oil and crackling in the spices. mix well..Pour it into the batter and mix well.
Add Eno salt and mix well. The batter will get foamy and light.
Now grease idli plate lightly with oil. If you are using cloth to line idli plates. Wet it completely in water. Spoon batter in and steam cook for 10 mins.
Now remove the plates from steamer and invert it on a plate. Carefully remove the cloth.