Ingredients:

4 cup rice
1 cup udad dal


Method:

Soak rice and dal for 2 hours.
Drain and dry under fan.
Give them in a flour mill and make soft powder.
When ever you want tomake dosa, you can take required amount of the powder and add hot water or butter milk and make dosa.
Dont forget to add salt.

Note: If you have this rice and dal mixed flour in your house, you can make 'thenkuzhal' also.