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Clean the fish heads with crystal salt and turmeric powder; if you don't want the eyes, remove them.
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Place the tamarind pulp in a basin and cover with water to soak.
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In a kadai, heat the oil and add the fenugreek seeds, mustard seeds, and cumin seeds.
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Combine sliced onions, slit green chilies, fresh ginger garlic paste, and curry leaves in a mixing bowl.
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Add the minced tomato and simmer for 2 minutes with the lid on.
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Stir in the turmeric powder, crystal salt (for flavour), and red chilli powder.
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Add fish heads (if desired, discard fish eyeballs and other pieces), mix well, and simmer for 2-5 minutes with the lid covered.
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Squeeze and remove the tamarind pulp, add the water, mix, and close the lid. Cook on medium heat for 5 minutes.
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Garnish with coriander and fish masala powder. Garnish the fish head curry with coriander leaves.