For preparing potato and fish fry, cook potatoes and mash them well.

Steam cook fish with turmeric and salt.

Take out the bones and mince well.

Heat a kadai, fry onion, ginger and green chillies.

Add fish, potato and mix well. Add chilly powder, mustard powder and salt.

Simmer the flame. Fry the mixture well.

Sprinkle coriander leaves on top and serve.(Potatoes must turn dark brown in color).