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Heat a dribble of the oil in a medium hot pan and sear the fish on both sides rapidly.
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Take out and keep warm nearby.
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Blitz everything bar the lemon, tomato purée and sugar to a thick paste in a mini blender or with a stick blender - you may want to add a little oil or a little water to help the blitzing.
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Add the remaining oil to the pan then cook the thick paste until it releases its aromas.
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Now turn the heat down a little and add the purée, lemon, spinach or two of sugar to balance the acidic tomatoes and enough water to loosen the paste.
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Turn your heat up again and return the fish fillets to the pan, bring the sauce around it to a gentle simmer and cover until cooked to your liking - I err on the side of less is more with fish and only want it to just turn from jelly to opaque (less than 5 minutes for my fillets but do adjust to your own preferences and go by the thickness of the fish when judging how long it needs).