Piyaz is a traditional Turkish salad that originated in Istanbul. It is made with white beans, onions, tomatoes, and parsley, all mixed together with a tangy dressing made from olive oil, lemon juice, and vinegar. Piyaz is often served as a side dish with grilled meats or as a topping for lahmacun, a popular Turkish flatbread. The combination of flavors in Piyaz creates a delicious and satisfying salad that is loved by locals and tourists alike.