Firstly, in a large bowl soak 1 cup of moong dal in water for 2 hours.
* drain off the water and blend to smooth paste without adding any water.
* Transfer the moong dal paste to a bowl and add ¼ cup curd.
* whisk and mix until the mixture is well combined.

Now in a tawa heat 2 tsp oil and splutter ½ tsp mustard, 1 tsp cumin, 1 tsp chana dal, 2 chilies, 1-inch ginger, few curry leaves.
* Also, add ½ carrot and saute for a minute.
* Transfer the masala tempering to the moong dal batter bowl.
* further add pinch hing, 2 tbsp coriander, and 1 tsp salt, and mix well.

Just before steaming add a ½ tsp eno (fruit salad mix well till it turns frothy.
* pour the batter immediately into the idli plate. do not rest the batter.
* steam the idli for 15 minutes on medium flame.
* Remove & serve instant moong dal idli with red chutney / green chutney and sambar.