Baklava is a sweet pastry that is made of layers of filo dough filled with chopped nuts and sweetened with honey or syrup. It is a traditional Turkish dessert and a popular treat in Istanbul. The layers of filo dough are buttered and stacked together, then baked until golden and crispy. Once baked, the baklava is soaked in a sweet syrup, which gives it a sticky and sweet flavor. It is often served with a cup of Turkish tea or coffee.