Soak the rice and urad dal together in enough water for 4-6 hours.
Wash and clean the Mudakanthan Keerai, take out the leaves. Grind into a smooth paste.
Now add rice dal mixture in batches and grind into a smooth batter.
Once the batter is ground, add salt and mix it well. Set aside for 8hrs or overnight.
The batter should be fermented and grown in quantity. Mix it well.
Meanwhile, heat the dosa pan. Take a ladle of the batter and spread it on the pan as thinly. If you prefer fluffy soft dosa, leave it a little thicker. Sprinkle oil around the edges.
As the bottom turns light golden brown and the edges raise up, remove from heat. Repeat the same with rest of the batter.
Serve with any chutney or side dish of your choice.