(Forehead slap) I should know by now to always check Snopes before responding to somethign like this.
When I first arrived in Oz, I made myself a vegemite butty kind of like a peanut butter one, with the stuff smeared on 1/4 of an inch thick. Couldn't finish it. Much later, a native made me one with just a tiny bit. I was hooked. And within 6 months I was eating it smeared on 1/4 of an inch thick.
Vegemite is one thing but.....
Even I, who quite likes Marmite - cannot imagine the idea of a Marmite sandwich
1/
4 inch thick - damn! that would make your eyes water!!

Steve