Marmite is very popular in the UK - vegemite too, but not as well known.
It is a kind of love-hate thing. I love marmite. I always have a great big jar of it in my cupboard.
Yes, it is a yeast extract (from the brewing process I believe - don't forget that although the idea of eating yeast sounds horrid, without it bread would not rise and beer would not ferment). It is very rich in B vitamins, but quite high in salt though.
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Time is an illusion. Lunchtime doubly so.
Epona of The Laughing Hyenas