Copyright: vegemite
Vegemite is a thick black Australian food spread made from leftover brewers' yeast extract with various vegetable and spice additives. Vegemite is salty, slightly bitter, malty, and rich in umami. Americans generally can't stand the taste of it.
Spreads that are similar to this are Marmite, Promite, MightyMite, OzEmite and D Swiss Cenovis.