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.