Are you wondering how this is pronounced? Well join the gang, because till date I too am struggling with the pronunciation.
We came across this hollow pastry when traveling to Cesky Krumlov (a UNESCO Heritage town in Czech Republic). This is a common Czech street food item (and I wonder how we missed it in Prague), cooked on open grills on the roads (town squares) and then sold hot with a dusting of cinnamon, sugar, and nuts (traditionally walnuts).
This pastry is made by wrapping the dough around a stick and then roasting it until the flour is golden brown and cooked. It is then coated with a dusting of cinnamon, sugar and walnuts but we also saw versions with chocolate and cream.
In terms of history (per wikipedia), the production of trdelník has a long tradition in the Slovak town of Skalica on the border with the Czech Republic where Earl József Gvadányi, a Hungarian general in retirement, had settled. He employed a cook from Transylvania who brought the recipe for “trdelník“ and improved it into the final pastry nowadays known as Skalický trdelník. Also, the name “trdelnik” comes from trdlo, the wooden stake the cake was traditionally wrapped around for cooking which gives it its traditional hollow shape.
So if have a major sweet tooth and want a quick respite during a city tour, when try your version of a Trdelnik.