Boil the spaghetti following packet instructions.
Meanwhile, mix the tomatoes with the onion, olives, chilli, lemon zest and basil.
Drain the pasta, return to the pan and toss well with the tomato mixture.
Add the sardines in chunky pieces.
Season with lemon juice, pepper and a little oil from the can if you like.
Sprinkle with lots of fresh parsley, capers and an extra red chilli on top!