Langos
One of the common delicacies you’ll find at a typical Christmas market, and often elsewhere, is the langos (pronounced lan-gosh), costing just over €2 each.
There are various ideas about what a proper langos should be. But in Vienna they’re made from a potato dough, which is deep-fried and then coated in garlic paste. This is not as bad as it sounds (close though).

© Mark Brownlow
The result is a large, flat, round, crispy snack which can be quite warming and filling on a cold winter’s night.
The Langos has its origins in Hungary, where the name appears to apply to both a bread and potato version, but one generally thicker than the Vienna equivalent, and with more toppings (particularly cheese and sour cream).