What is Gruit?

People generally think of gruits as un-hopped beers. But we like to think of them as beers that are free to contain a larger number of ingredients than your modern American brews, beers not limited by the archaic strictures implemented by 16th century imperialists with monopolies on hop growing. So we let our imaginations run - as, I'm sure, did the world's earliest brewers. Below are some, but by no means all, of the ingredients we like to use.