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Pre-heat the oven to 200°C (180°C fan-forced) and lightly grease a large baking dish.
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In a pot of boiling salted water, add the pasta and cook as per packet directions.
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In a small frying pan, heat oil over a medium heat. Add onion and cook for 4 minutes, or until onion becomes translucent and aromatic. Add tomatoes, salt and pepper, cover and cook on a low heat for 20 minutes, or until the sauce has thickened.
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Add tuna and basil, stirring until well combined. Add the cooked pasta, tossing until well coated.
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Place half the pasta into greased baking dish, sprinkle over ½ cup Parmesan cheese to cover pasta. Add remaining pasta and sprinkle with remaining Parmesan cheese.
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Cover baking dish with foil and place in preheated oven for 25-30 minutes until cooked. Remove foil for the last 5 minutes of cooking to allow the top of the pasta to become golden and crisp.
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Serve and enjoy with family and friends!