What's vegemite?
No one truly knows.
Australians drink an enormous amount of beer, more than maybe any population on earth.
They're pickled in so much alcohol, they cannot remember anyone's name unless it's "Mate".
But the countless tons of vegemite consumed every year could not possibly be produced just as a by-product of brewing beer.
That may be part of it, but there has to be a huge amount of some other unidentified ingredient, like, maybe........people.