From Lifehacker.com….
Marmite is a condiment that forces one to exercise restraint, and people hate her for it. It’s a thick, yeasty paste that tastes like condensed, slightly burnt soy sauce, and even a modest amount can overwhelm one’s palate and ruin a perfectly good piece of toast. But once you learn to harness its salty power, you’ll have a mighty (vegan) source of deep, dark umami.