For the filling,heat oil in a kadai,Splatter mustard and cumin seeds
Add in green chilli,ginger,curry leaves and mix well
Throw in onions and saute for 3 min
Add in red chilli powder,turmeric powder,salt and mix well
Now add in the boiled mashed potatoes and mix everything together
Garnish with coriander leaves and lemon juice and mix well,Let this cool down
Divide this into equal portions and form smalls out of it
Heat oil for deep frying
Now make the batter by mixing gram flour,rice flour,ginger garlic paste,salt,baking powder,turmeric powder,chilli powder along with water and form a smooth paste out of it
Dip the potato ball in the batter and deep fry in heated oil till golden on both sides
Serve hot with coconut chutney