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In a large saucepan, gently simmer garlic, zucchini, celery, and kale in a good drizzle of olive oil until soft.
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Add in tomato paste, tin tomatoes, pasta sauce and tuna and simmer for 30 minutes.
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In the last 12 minutes of the sauce cooking, into a pot of boiling salted water, add the pasta and cook as per packet directions.
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Once pasta is cooked, add it to the sauce and season with salt, pepper and parsley.