Add cooking soda only to portion of batter you are going to use. Do not keep/ store batter to which soda is added. If you are not going to use the entire batter, keep the remaining batter in the fridge and add soda only to portion you are going to use.
We usually do not add cooking soda and yet get crispy, tasty dosas.
You could make the dosas either thinner and large size or smaller and thicker mini dosas.
You could make Masala Dosas using the same batter. For the recipe for Potato bhaji and method of making masala dosa, click here.
You can skip adding butter and roast dosas with only ghee.
The measure called ‘pav’ used above is a traditional measure followed in many homes in South India. 1 pav equals 1 ½ cup approx. You can use your regular cup measures but make sure you use the same cup measure for both rice and urad dal.
Never add ghee/ butter onto centre of dosas when you cook, it makes them soft and does not get the golden color. Drizzle around edges and roast till edges start to turn brown.
For those who have the luxury of getting hold of homemade butter, make and serve dosas with them. Else you can use store bought butter.