Börek is a traditional Turkish layered dough dish, generally filled with cheese, ground meat or vegetables. The most popular fillings are feta cheese, spinach, potatoes and ground meat flavored with a variety of herbs and spices.
The dough, called yufka in Turkish, is quite labor-intensive. Not many Turkish households attempt to prepare it themselves. They are sold in 3-5 sheet packs in supermarkets here. Yufka is essential for you to prepare this dish. Never ever substitute it for thin phyllo; it will not be the same. Phyllo is super thin and it will get too crispy in the oven. You may find yufka at your local Middle Eastern deli, but if not, you can also buy it from Amazon.