firstly, in a large bowl soak 1 cup 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 chilli, 1 inch ginger, few curry leaves and 5 cashew.
also, add ½ carrot and saute for a minute.
transfer the masala tempering to moong dal batter bowl.
further add pinch hing, 2 tbsp coriander, 1 tsp salt and mix well.
just before steaming add a ½ tsp eno (fruit saland mix well till it turns frothy. alternatively, add a pinch of baking soda.
pour the batter immediately into the idli plate. do not rest the batter.
steam the idli for 15 minutes on medium flame.
finally, serve instant moong dal idli with green chutney and sambar.