To make this idli recipe with idli rava, wash and soak urad dal and idli rava in separate containers for about 4-6 hours.
Drain water from soaked urad dal and add the urad dal to a mixie jar and grind to a fine paste using a little water in between.
Drain the water from idli rawa; squeeze out any excess water from it with your hands. Add the idli rava to the urad dal batter. Blend for a couple of seconds till the idli rava folds well into the urad dal batter.
Pour the ground idli batter into a large vessel and add salt.Mix the batter well with your hand. The batter should be smooth and fluffy. Cover and leave to ferment for 8-12 hours or overnight in a warm place.
The fermented idli batter would have increased in volume. It will have air bubbles and feel light. Mix the batter gently with a ladle.
Bring water to a boil in the pressure cooker over medium-high heat.
Grease idli plates with ghee and pour a ladleful of batter in the moulds. Place the idli stand in the cooker with the idli plates above the level of boiling water. Cover with the lid and steam for 10-15 minutes without the weight valve over a medium-high flame.
Leave to rest for 5-10 minutes.
Open the lid and remove the idli stand from the cooker. Allow to cool for 1-2 minutes.
Demould fresh, spongy idlis and place them in a serving bowl.
Serve hot and fresh Idlis with steaming hot sambhar, coconut chutney or idli podi mixed with a little hot ghee.