Clean and lightly season the fish with salt and turmeric.
Heat mustard oil and lightly fry the fish pieces until golden. Remove and set aside.
In the same pan, sauté tomatoes and green chilies.
Add turmeric and a little water, then cook until the tomatoes soften.
Add the fried fish and simmer for 8–10 minutes.
Add lemon juice or elephant apple for the signature tangy flavor.
Garnish with fresh coriander and serve hot with steamed rice.