firstly, in a large mixing bowl take 2 cups of leftover dosa batter / idli batter.
add in 1 tbsp rava and 1 tbsp rice flour.
also add 2 tbsp onion, 1 inch ginger, 1 green chilli, 2 tbsp coriander, 1 tsp cumin and ½ tsp salt.
mix well making sure everything is combined well.
add more rice flour if required to get thick batter.
now dip your hand in water, and start make lemon sized vadas.
drop them one by one to hot oil.
keep the flame in lower to medium stir occasionally.
also fry the punugulu till they turn golden brown.
drain off the punugulu on to kitchen towel to absorb oil.
finally, serve punugulu with coconut chutney or tomato sauce.