Very often, foreign food simply keeps its name. To me, this is something different than other processes of word adoption. This is because people eating "exotic" food tend to be aware that they're eating something non-local. When they use a foreign non-food term, however, this is often not the case.
In English (and probably lots of other languages), the sweet fruit cake known in German as Stollen and mostly eaten around Christmas time has thus simply kept its name.
Word of the Week will be back in January. Have a relaxed holiday!
The image is from whatscookingamerica.net.