Wash and soak barnyard millet alongwith methi seeds for 5 to 6 hours.
Wash and soak udad dal for 5 to 6 hours.
After 6 hours, drain thewater from udad dal. Transfer to a mixer jar. Add some water and blend to a fine paste.
Transfer the udad dal to a deep vessel.
Blend barnyard millet and methi seeds to a fine paste.
Add this to the udad dal paste.
Add salt and mix well.
Keep aside for fermentation for 13 to 14 hours.
After 14 hours, the batter would be fermented.
Grease idli plates with oil.
Pour the idli batter into idli moulds.
Boil water in a steamer or idli cooker.
Place the idli plates in the steamer.
Steam the idlis for 15 to 20 minutes or till the idlis are cooked.
Unmould the idlis and serve them hot with chutney and sambhar.