Wash and soak the sago in 4 cups of water for an hour.
Drain off all the water and spread it on a kitchen towel to remove excess water.
Keep it aside till it is dry, about half an hour.
Meanwhile add salt, red chilli powder, coriander leaves and zeera to mashed boiled potatoes.
Mix in the sago when it is dry.
Make small balls of the mixture and flatten them.
Shallow fry on a non-stick gridle pouring a little cooking oil on the edges.
Flip the vadas when golden brown and crisp on one side.
Serve with chutney.