A drink traditionally made from partly fermented dandelion (
Taraxacum officinale) and burdock (
Arctium lappa) roots with sugar, however there is strong rumour that commercial 'Dandelion and Burdock' is sometimes flavoured with sassafras, an Asian Laurel tree, or, with a synthetic sassafras flavouring.

Image: http://www.fentimans.com
The combination of Dandelion and Burdock was formerly seen as an all-round medicine:

Northampton Mercury - Saturday 9 March 1889