I have been trying to make dosa in the US since 6 months & never got the fermented batter. When searched in seasoned advice I found a similar question asked. How to ferment dosa batter?
I have been using correct proportions of rice, urad dal, fenugreek & poha. Even I tried grinding the mixture using soaked urad dal, rice, water and even kept overnight in the oven with lights turned on, but I never got my dosa batter fermented. I have used the same proportions in India and I was successful in making good fermented dosas, but the only difference is that I am using Sona masoori rice for making dosas in the US. I am suspecting that this might be causing a problem , but I am not sure about this and if it is yes, why is it so ?