Wash and soak rice for 5 to 6 hours 

Drain both. Take urad dal and grind in a blender, make it as a smooth batter. Grind Rice.The rice will not be super fine but will have small grits

Grind cooked rice then add to the batter 

Mix all these ingredients well. Add salt to taste 

Cover this and let it ferment overnight or 8 to 10 hours.

Next day morning you will get a risen batter. Mix this batter well

Grease idli plates with little oil and spoon the batter into each moulds

Cook this Idly batter for 10 minutes 

Serve with sambar, chutney or Idly powder