Soak rice, udad dal and pooh in water for 8 hours.
Drain the water out and grind the mixture to make a fine paste. Mix in a pinch of salt. Keep the paste in a moist place, away from air or sun for 4 hours to allow the paste to get fermented.
Heat a thick taw and grease it with some oil.
Spread a thin layer of the fermented paste on the taw to make a big round tortilla (root) like shape. Cook on low heat for 2-3 minutes until the round tortilla becomes light brown and crispy. Dosa is now ready.
Clean the tawa with tissue before greasing it again with oil. Repeat by making a thin layer with the rest of the paste to make more doses.