In a frying pan, add 3 tbsp. of oil and fry diced onion, green chilies, garlic and ginger till the onion is golden brown. Add coriander and mint leaves.
Add boiled de-boned fish and continue frying. Add salt and pepper to taste, remove from heat and cool.
Add mashed potatoes, salt and mix into a dough. Form into cutlets of desired shape [round, long fingers, oval, heart shaped etc.].
Beat egg with little salt and pepper. Coat cutlets in egg and roll in breadcrumbs.
Heat a 4 tbsp. of oil in a frying pan and shallow fry until golden brown on both sides.
Serve hot with onions rings and garnish with coriander leaves.