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Heat olive oil in a large frypan over medium heat. Sauté red onion and fennel until softened.
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Add garlic, fennel seeds, chilli and capers and sauté for 1 minute.
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Add tomato paste, cook for 30 seconds and add chopped tomato. Cook for 5 minutes, adding water if required to achieve a sauce consistency.
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Add tinned tuna and stir to combine.
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Meanwhile, into a pot of boiling salted water, add pasta and cook according to packet directions reserving some of the pasta cooking water.
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Add pasta to the sauce and toss to combine. Season with salt and pepper and stir through the chopped parsley.
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Serve with a garnish of fennel fronds and lemon zest.