Put rice and uzhunnu separately in water for soaking.
Allow it to soak atleast 3 - 4 hrs.
:- Soaking for a long time gives more softness to dosa.
Grind rice and uzhunnu separately by adding water, while boiled rice along with any of these to a smooth form.
:- Do not add much water to rice.
Keep overnight and use the batter for dosa.
Before making dosas, add enough salt and mix well.