In the former Yugoslavia, "burek", also known as "pita" in Bosnia and Herzegovina exclusively, is an extremely common dish, made with yufka and the Bosnian variant is arguably the most regionally prominent. It may be eaten for any meal of the day. In Bosnia and Herzegovina, the burek is a meat-filled pastry, traditionally rolled in a spiral and cut into sections for serving. The same spiral filled with cottage cheese is called "sirnica", with spinach and cheese "zeljanica", with potatoes "krompiruša", and all of them are generically referred to as "pita". Eggs are used as a binding agent when making "sirnica" and "zeljanica". This kind of pastry is also popular in Croatia, where it was imported by Bosnian Croats, and is usually called "rolani burek" (rolled burek). In Serbian towns, Bosnian pastry dishes were imported by war refugees in the 1990s, and are usually called "sarajevske pite" or "bosanske pite" (Sarajevo pies or Bosnian pies). Similar dishes, although somewhat wider and with thinner dough layers, are called "savijača" or just "pita" in Serbia. These are usually homemade and not traditionally offered in bakeries. In 2012, Lonely Planet included the Bosnian burek in their "The World's Best Street Food" book. In Serbia, Albania, Kosovo, Croatia, Montenegro, North Macedonia and Slovenia, "burek" is made from layers of dough, alternating with layers of other fillings in a circular baking pan and then topped with a last layer of dough. Traditionally it may be baked with no filling ("prazan", meaning empty), with stewed minced meat and onions, or with cheese. Modern bakeries offer cheese and spinach, apple, sour cherries, potato, mushroom, and other fillings. The recipe for "round" burek was developed in the Serbian town of Niš. In 1498, it was introduced by a famous Turkish baker, Mehmed Oğlu from Istanbul. Eventually burek spread from the southeast (southern Serbia, Kosovo and North Macedonia) to the rest of Yugoslavia. Niš hosts an annual burek competition and festival called "Buregdžijada". In 2005, a 100 kg (220 lbs) burek was made, with a diameter of 2 metres (≈6 ft) and it is considered to have been the world biggest burek ever made.