syrupy phyllo pastry filled with custard, common throughout Greece and Cyprus. In the Epirus, σκερ-μπουρέκ (derives from the Turkish şeker-börek, "sugar-borek") is a small rosewater-flavoured marzipan sweet. Bougatsa (Greek is a Greek variation of a borek which consists of either semolina custard, cheese, or minced meat filling between layers of phyllo, and is said to originate in the city of Serres, an art of pastry brought with the immigrants from Constantinople and is most popular in Thessaloniki, in the Central Macedonia region of Northern Greece. Serres achieved the record for the largest puff pastry on 1 June 2008. It weighed 182.2 kg, was 20 metres long, and was made by more than 40 bakers. In Venetian Corfu, boureki was also called burriche, and filled with meat and leafy greens. The Pontian Greek piroski (πιροσκί) derives its name from borek too. It is almost identical in name and form to pirozhki (Russian: пирожки), which is of Slavic origin, and popular in Russia and further east. Serbia 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. 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. Slovenia In Slovenia, burek is one of the most popular fast-food dishes, but at least one researcher found that it is viewed negatively by Slovenes due to their prejudices towards immigrants, especially those from other countries of former Yugoslavia. A publication of a diploma thesis on this at the Faculty of Social Sciences of the University of Ljubljana in 2010 stirred controversy regarding the appropriateness of the topic. The mentor of the student that had written the thesis described the topic as legitimate and burek as denoting primitive behaviour in Slovenia in spite of