I haven't tried Vegemite. I didn't try Marmite for years, either, 'cause it's kind of sinister, and I still don't like too much of it. But oh yes to either of them as hangover food. Mmmmm. *wants Marmite toast now*

I have, however, recently tried Guinness Marmite. It's... well, it doesn't taste much different, really.