Dosa(i) flour

Idly Rice - 3 cups
Urad Dal - 1 cup

Wash and Soak both of the above separately for around 4 to 6 hours.

Then grind both of them separately nicely with some (lesser) water. Finally mix them both together very well along with 1 and a half tblspn salt.

Keep the flour overnight, outside (fridge) for fermentation.

In the morning you can see the flour become fluffy.

Then keep the flour inside fridge and u can make dosa as you wish.
Just before u make dosa, if u feel the flour is solid, add little water and you can go ahead.
Enjoy!