What is a spread made from fermented yeast called?

Vegemite is one, and there is another one called Marmite is another. there are a couple of different brands.

Marmite is the British version - also sold in Northern European countries as well.

Lol, I first read "why do Jews hate yeast in their BEARD" and was going to make a joke about my mother's husband, who is an Ultra Orthodox Jew with a thick long beard always having to clean crumbs out of his beard. But Sour Lime and Aravah are spot on. It is only during Pesach (Passover) that we eat unleavened bread, and that is to commemorate that when the Jews were slaves in Egypt, and when they were fleeing Egypt they did not have time to bake and wait for their bread to rise, so they made Matzoh which has no yeast and cooks in a matter of minutes.

spread fermented yeast called

You're probably thinking of Marmite. I think it's British but it's also popular in Australia and new Zealand. If you're looking for some, I've seen it in most Indian grocery stores (not that it's Indian food, but the Indian stores have some British foods).

Marmite in England; Vegemite in Australia (Think "vegemite sandwich" - Men at Work

Vegemite.. Nothing else can compare to it..

I love the stuff.. its good with cheese melted under the griller..

Be careful with those things though, a scraping is all thats needed.. Its not like peanut butter..

It`s Marmite,its a by product of the brewing industry.Some love it others like me hate the stuff