How to make Sponge dosa
Par boiled rice/ Idly rice/ Idli Pulungal arisi – 1 1/2 cup
Raw rice/pachaarisi -1/4 cup
Whole urad dal (without skin)- 1/4 cup + 1 1/2 tbsp
Fenugreek seeds – 1 tsp
Oil for making dosa
Soak both rice, urad dal and fenugreek seeds together for 5-6 hours and grind it to a smooth paste.
Add required salt and mix well with your hands. Let it ferment for another 7-8 hours or overnight.
Add needed water to the dosa batter as the consistency of the batter should be thinner than the regular dosa batter. Mix well. (see pic 1)
Heat a tawa or dosai kal on high flame, once it is heated, pour a ladle of batter. Do not spread much as the batter will spread itself.
When you find holes appearing on the surface (see pic 2) reduce the flame to low and cover it with a lid.
Once the top gets cooked, remove from flame. You do not have to flip over the dosa. Repeat the process for the rest of the batter.