Soak rice, poha in buttermilk overnight. In the morning add it to the blender, (if there is lots of buttermilk left please drain it, a little amount is not a problem).
Blend it into a smooth paste. Add enough water to make into smooth batter. The batter should be little bit thinner than the dosa batter.
Now add in salt and baking soda and mix well.
Heat a pan. Try to use non stick. Pour a ladleful of the batter in it, don’t spread the batter..It will spread automatically.
Drizzle some oil around the sides. Cover it with a tight fitting lid and let it cook for a min.
Now there will be small holes formed over the top. Remove and Serve..
Notes
If there is no holes formed, add some more baking soda or check if the batter is thick..If it is thick add some water and adjust the consistency.