Wash and soak Samvat rice/barnyard millets separately for 1 hours.
Drain all the water and grind with curd.
Transfer the batter in a large bowl, cover and let it fermate over night or for 6 to 8 hours
When ready to make idli, add sendha namak and mix gently to combine well.
Heat water in idli cooker or steamer and grease idli plates
fill each impression with a ladle full of batter
Place idli plates on steamer or idli cooker and steam for 8 to 10 mins or until cooked off flame and allow to cool for 5 mins before you open the steamer.
serve hot with coconut chatny
Notes
You can prepare tadka of cumin, finely chopped curry leaves, grated ginger and add in to batter before steaming idli to add more flavors.