Mom. Vegemite, it awesome stuff...
The best known cure for a hangover is a thick Vegemite sandwich (You'll never find a better source of B-vites!) and a large glass of juice.
A Vegemite sandwich actually has more Vitamin B than a any of the Vitamin B complexes you can buy.
It's a great morning starter on toast, it goes well with cheese (It's an average kids favourite lunchtime food).
I use it in cooking sauces and gravies.
Most don't like it as thick as I do, but it's something you'll not be able to get enough of once you get the taste for!
Remember, usually all you need is a thing even coating, not enough to cover up the bread and butter completely, you want to be able to see it underneath.