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First get all the ingredients ready. Bring a pan of water to the boil, add the beans and boil for 2-3 mins until just tender. Drain, rinse with cold water to cool, then drain again. Pod the beans from their skins into a large mixing bowl, discard the skins. Halve cucumber lengthways, scrap out the seeds using a teaspoon, then slice into half-moons and throw in with the beans. Split the pittas so you have 6 thin circles of bread, then toast.
Whisk together lemon zest, juice, olive oil and sugar with plenty of seasoning. Pour over the beans and cucumber, add all the herbs and toss together. Tear the toasted pitta into pieces and add this to the salad with the crumbled feta. Toss together very gently – hands are best – then pile onto a platter to serve.