firstly, in a large bowl take 1 cup samo rice, ½ cup sabudana and soak in water for 5 hours.
now dtain off the water and transfer to the mixi.
add water as required and blend to a smooth paste.
transfer the samo sago batter to a large bowl.
add 2 tbsp curd, ½ tsp salt and mix well.
cover and rest for 4 hours or until the batter is fermented.
now heat the non-stick pan and pour a ladleful of batter, spreading slightly.
cook on medium flame until the dosa is cooked completely. you can over and cook if your dosa is not cooking uniformly.
finally, enjoy upvas ka dosa or vrat ka dosa with spicy chutney.