in a blender take 1 cup of cooked rice, ½ cup wheat flour and 1 cup rice flour.
add ½ - to 1 cup of water to blend smooth.
add more water in batches if required and blend to smooth paste. i have used 1½ cup of water in total to blend smooth.
transfer the smooth paste to a large mixing bowl.
add ¼ cup of curd. use normal or sour curd.
now add salt to taste and baking soda.
mix well and get to dosa batter consistency. add more water to adjust consistency.
heat the griddle. sprinkle some oil and wipe off with a tissue. (do not add oil if using non-stick pan)
once the tawa is hot, smear some water over the tawa and wipe off with a tissue paper.
pour a ladleful of batter and spread out in a circular motion.
add some oil on top of the dosa
cook them covered for a minute or till it turns golden brown and crisp.
fold the dosa into half
serve dosa hot with coconut chutney and sambar