Boil spinach, chilies, ginger, garlic, and cumin;then add to a blender with 2 tbsp curd to form a smooth paste.
Add remaining curd and semolina to the paste, adjust with water to get idli batter consistency. Let it rest for 10 minutes.
Heat ghee, add mustard seeds, urad dal, and cashews in a pan. Add this to the batter with salt.
Grease idli moulds, mix Eno fruit salt in the batter, and fill the moulds.
Steam in a boiling steamer for 15 minutes.
Turn off the heat and let the idlis sit for 5 minutes.
Remove the idlis from the moulds and serve the Spinach Idlis hot and enjoy!