firstly, in a large mixing bowl soak 2 cup idli rice for 5 hours. alternatively, use dosa rice / sona masuri rice.
in another bowl soak 1 cup urad dal for 3 hours.
drain off the water from urad dal and blend to smooth paste adding water as required.
transfer the smooth and fluffy batter of urad dal into a large bowl.
in the blender take soaked rice and add 3/4 cup of washed thin poha.
blend to slightly coarse paste adding water as required.
transfer the rice batter to the bowl of urad dal batter
mix it well
now cover and rest in warm place for 8-10 hours or till the batter ferments and doubles.
after 8 hrs add 1½ tsp salt to the batter and mix well
grease a plate and pour some of the batter in it
add it in the steamer or cooker and steam for 10-15 minutes
remove it gently and serve hot with sambhar
