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Cheese, actually Curd/Spinach/Cabbage/Meat/Apple
All the above can be used as filling for burek in addition to the way pastry is assembled/rolled to create regional varieties.
But going back to OP - there is absolutely no worries about being vegetarian in Turkey. Travelled the whole of the country mid 80s than lived two years on the south east coast (Alanya) back in 90s and the abundance of non-meat dishes is staggering, at least compared to what was on offer in UK when moved here.
Equally I do not think your second part of the route will be boring, it is after all a different country with different landscape, culture, sound, smell and taste. My first visit was by mix of busses and hitchhiking and even when waiting for hours for a lift on empty, dusty roads, helped by listening to mr slowhand on my (tape) Walkman, I was amazed by how everything was just...... different.
And the boxes in Istanbul will not be that difficult to obtain, if you do get stuck, ping me a PM, I have few mates that can at least ring around the shops to find you one.
As just seen you last comment re cash - yes csh is king, but do not hold too much on you, no need as prices are very low compared to UK. Another thing to remember is that tech is also king in Turkey, they are quite advanced contrary to some perceptions. Even in 80s they had fully airconditioned busses of the highest quality, while in the UK......Good luck with the trip
Ah yes, I encountered burek in Croatia last year, never partook though as to me it was always rather nebulous as to whether it had meat in it or not. Will have to learn some meaty words to avoid.
Fizzy milk conjures memories of playing around with a soda streamer in my youth - think I'll be giving that a miss as well.
Will keep an eye out for the earring!