Trdelník is made by wrapping dough around a stick and then roasted over an open flame until it is golden brown. It is then brushed with butter and rolled in cinnamon sugar and served with different fillings spread inside such as Nutella or icecream.
The sellers call it Traditional Trdelník. There is absolutely nothing traditional about Trdelník. It appears a few years ago as a cheap way how to get as much money as is possible from tourists. We have better things to eat than Trdelník ;-)