Here is a link to an interesting article about börek from Turkish Airlines

http://www.turkishairlines.com/en-INT/skylife/2011/february/articles/the-wonderful-taste-of-wheat-turkish-savory-pastries.aspx

börbör??

Turkish has a verb meaning to cook lightly:
bört-mek

It suggest that there once was a verb (though not listed in the dictionary) like bör-mek

And it suggests that it could be a derivation of that verb:
bör-ek

It is found in most turkic languages.

It is a loanword from turkish in balkan languages, as well as in persian (bu:rak)

Some regard it a loan from other turkic languages in russian etc.

Turkish bört= "to cook lightly" or "to rise up and swell with water" in eastern Turkic.

Also proposed is mongolian bürü= "to be covered" is mentioned by some
others, there is also a similar turkic verb.

börek; açılmış hamurun veya yufkanın arasına, peynir, kıyma, ıspanak vb. konularak çeşitli biçimlerde pişirilen hamur işi:
puf böreği. kol böreği. nemse böreği.-

In Farisi ( Iranian language) it is " Burek " (u is long)..so this word is transferred into Farisi from Turkish.

i really wonder exactly from what verb "börek " derived.

BEST ONE IS "SU BÖREĞİ" (WATER BÖREK) !!