2) Meanwhile put the tuna in a medium bowl, breaking it into large chunks, along with the onion, celery, olives and capers.
3) Drain and chop the tomatoes. Add to the tuna mixture and toss to combine. Add the olive oil, lemon rind, juice and basil and toss again.
4) Season to taste with salt and pepper. Serve cold with toasted bread or salad leaves if desired.
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