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First get your potatoes on to cook - place in a sauce pan and cover with plenty of cold water and bring to the boil. New potatoes can take between 10-20 minutes to cook depending on variety and size so it's better to get them on at the start.
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Once yielding to your knife, drain well and return to the pan with a generous amount of salt and black pepper - they would add a worrying amount in the Canaries but I feel half a teaspoon is more than enough! Leave to stand and steam a little whilst the fish cooks - which doesn't take long at all.
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Prepare the sauce by blitzing the drained tomatoes, pepper and vinegar to a smooth puree with a stick blender or in a food processor.
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Heat the oil in a medium sized saucepan then add the cumin, paprika and garlic - sauté for 30 seconds then add the tomato sauce.
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Bring up to a simmer then tuck in your fish fillets - loosely roll them up if you need get them in and place with the roll side exposed to allow for even cooking.
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Partially cover and cook for about 5-6 minutes, depending on how thick the fish fillets are. They are cooked once opaque and the flesh flakes easily.
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Serve in shallow bowls with the potatoes on the side.