Vienna and Frankfurt have argued for over a century about which city actually invented it — in Austria it's simply called a 'Frankfurter,' while Germans call the same sausage a 'Wiener.'
A smooth, finely emulsified pork-and-beef sausage in a thin natural casing is gently poached and served hot in pairs with mustard and a bread roll. Vienna's countless Würstelstand kiosks sell them around the clock, from lunch crowds to post-opera night owls.