Treat whose name is German for "whirlpool” (7)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
strudel
(Other definitions for strudel that I've seen before include "Dessert of thin pastry filled with fruit" , "Pastry with filling (usually apple)" , "Rolled pastry dessert" , "A German baked pastry" , "Austrian fruit-filled pastry" .)