On a nude hiking week in the Austrian Alps we were asked to bring a food item especially reflecting our own country. There were people from all over the world so there was a vast variety of national dishes. I took a jar of Marmite. They ate it on toast and were fascinated.
I didn't grow up with it, was hopeful when I tried itthat I would like it but found I didn't--at all. But I would encourage anyone to use it, it's quite nutritious with respect to B vitamins in particular.
I think what we grow up with has a strong influence on our tastes in later life, although tastes can change...
I like Marmite and don't think that the fact it comes from the brewing industry is relevant to a tea-totaller - it doesn't contain alcohol and that surly is what is important to them?
What would I, an American, have brought? Popcorn, I think. It's a uniquely American food. When I visited an international Scout chalet in Switzerland in 1965, we brought some along, and the other scouts, from all around Europe, had never seen it before.
I'm sure it's made inroads into cuisine elsewhere in the world by now, though.