Since feta is the main ingredient here, it really does make a difference if you can get hold of chunky fresh feta from a deli or a Middle-Eastern store, but this still works with good-quality feta in packages. A bowl of baby spinach salad on the side is, along with puffy — rather than crisp — Turkish flatbread (or side), my favourite accompaniment. Steeping the onions in vinegar — and old trick of mine, which many of you may recognise — not only takes away the acrid rasp of raw onion, but…