g/3oz pasta, such as penne or conchiglie • unwaxed lemon, finely grated zest and juice • red onion, finely chopped • olive oil, ideally extra virgin • cucumber, peeled and cubed • g/3½oz cherry tomatoes, quartered • g/½oz fresh basil, roughly chopped • g/2¼oz feta, crumbled (optional) • pitted black olives (optional) • sea salt and freshly ground black pepper