Marmite works in Gravy, cottage/shepherds pies, beans on toast, on roast potatoes. In a casserole, in spagetti with some parmesan, on toast as dippers into boiled eggs, in tomato soup, as a bovril alternative for a hot drink, with cheese, as a mini cheddars flavour............. You lose I bet...
I know peanut butter and jam is popular, I once did marmite and jam (by accident together on toast and it was strangely nice - though clearly putting 2 things on toast together accidentally must have meant I was a bit caned or something)
Peanut butter and marmite together though. Wrongness