What' as gruit? According to Wikipedia:
Gruit (alternately grut or gruyt) is an old-fashioned herb mixture used for bittering and flavoring beer, popular before the extensive use of hops. Gruit or grut ale may also refer to the beverage produced using gruit.To the best of my knowledge, I've only ever tried on gruit: Beau's Bog Water. I'll have to look for others!