Fattoush is a Levantine bread salad built on crisp, lemony vegetables and torn pieces of toasted or fried flatbread, finished with a tangy sumac dressing. Unlike salads where the dressing is an afterthought, here the lemon, sumac, and red wine vinegar are the backbone -- bright enough to stand up to the crunch of fresh cucumber and romaine. It's traditionally a way to use up stale bread, so the bread should stay crisp rather than soak into sogginess.