Here is Serbia there are really good burger joints, most of them are like kiosks on the streets. There stuff like burgers stuffed with ham and cheese, burgers with sesame seeds, burders cooked in something we call kajmak, which is a traditionally dairy product that it somewhere in between chease and sour cream, and a whole bunch of ill combinations.
Serbia's is pretty much hell for a vegetarian or vegan, I know of one microbiotic restaurant in all of Belgrade, a there are maybe like 4-5 dishes in chinese restuarants that are vegetarian, one falafel joint, assorted veggie pizzas and that's pretty much it.
But meat, goddamn, if you're gonna sit down to eat, just go to any kafana, like a tavern, and order the mixed meat dish and you get a little bit of everything to sample and I've hardly seen anyone finish a whole dish.
Burgers stricly though and grilled, fastfood type specialties, there are probably about 3-4 in Belgrade that are ace as fuck.