Method:

Soak dal and rice in water for about 3-4hrs.
Grind rice and urad dal (washed in water to make it soft) and salt. Make it to the consistency of dosa batter. Keep overnight for fermentation.
Heat the tava & add little oil.
 Pour the batter in the tava(mix the batter well before using it).
When it is fried from one side, turn & cook on other side. Serve hot with coconut chutney