Add spinach (washed), curd, ginger and green chilies in a grinder jar.
Grind to a fine puree.
Take semolina in a bowl.
Add the spinach puree, salt and water. Mix well.
In a small tempering pan, add oil.
When oil turns hot, add mustard seeds, urad dal and chana dal. Let them turn brown.
Add cashews and brown them.
Add curry leaves and let them turn crisp.
Immediately transfer to the batter.
Give it a good mix and rest for 15 minutes.
After 15 minutes, check for the consistency. If the batter is too thick, add little water. We needed to add 2 tbsp of water.
Just before steaming, add baking soda and mix vigorously.
Pour the batter in greased idli moulds, filling them about 3/4 full.
Steam for 15 minutes.
Take the moulds out from the steamer after 15 minutes and let them cool a bit, hardly 2-3 minutes.
Remove the idlis from moulds using back side of the spoon or knife.
Enjoy with sambar and coconut chutney or with only chutney.