Wash 2-3 times and soak the urad dal with fenugreek seeds together in enough water and rice separately in enough water for 6-7 hours, cover and keep aside .
Once soaked enough. Blend the urad dal and fenugreek seeds together in a mixer till smooth and frothy (add water little by little as required). Remove into the large mixing pot and keep aside.
Blend the rice and leftover rice or soaked poha together in a mixer till smooth using required water, mixture should be semi thick but not runny. then add it into the prepared urad dal paste.
Mix well the urad dal paste and rice paste together, cover it and keep aside to ferment overnight or 7-8 hours in warm place.
Once the batter is fermented, add salt to the batter and mix well.
Boil the water in Idli cooker and grease the Idli moulds with using oil, then Put spoonfuls of the batter into greased molds and steam for 7-8 minutes.
After steaming remove the mould from cooker and allow cooling, then remove idlis from mould with using knife or spoon.
Repeat with the remaining batter to make more.
Serve hot with coconut chutney, tomato chutney and sambar.