Put 3 tablespoons of the vegetable oil in a large heavy-based pan to set over a medium-high heat. When hot, add the panch poron and fry until the nuggets of fenugreek turn deep golden brown, then turn the heat down to medium and add the onions, ginger and garlic and fry for 8 minutes until the onions are soft and brown.
Rub the chunks of cod lightly with 2 teaspoons of the ground turmeric, then, in a separate large non-stick frying pan setover a medium-high heat, add the remaining 1 1/2 tablespoons of vegetable oil and when hot, flash fry the fish for 1 minute, then set aside.
Add the chopped tomatoes to the onion mixture and cook gently for 6 minutes or until most of the liquid has evaporated, then add the remaining 1/2 teaspoon of ground turmeric, the chilli powder, tamarind paste and brown sugar and give everything a good mix together.
Gently add the fish to the sauce and simmer for 8-10 minutes or until the fish is tender and cooked through. Finish by stirring through the fresh coriander just before serving. Add a little water if necesary to loosen to your taste.
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