Traditional Feta Cheese borek already baked and kept frozen for freshness. Already Cooked. Ready to Eat.Börek (also burek and other variants) is a family of baked filled pastries made of a thin flaky dough known as phyllo (or yufka). It can be filled with cheese, often feta or kasar; minced meat, or vegetables. It may have been invented in what is now modern Turkey, in the Anatolian Provinces of the Ottoman Empire in its early era, to become a popular element of Ottoman cuisine or it may date back to the Ancient Roman cuisine of the region. A börek may be prepared in a large pan and cut into portions after baking, or as individual pastries. The top of the börek is often sprinkled with sesame seeds.