While the jury debates the Marmite issue, I only discovered the other day, that it's also great with plain pasta!
Mrs Growster likes the idea of an egg on top, Larders because she's the only girl in the world who has a salt deficiency, but she hates Bovril, so it'd have to be Marmite! There again, she doesn't like Vegemite either, while I do!
She's now back on a diet of Marmite on a Multi-seeded Ryvita for breakfast, and I used to take that with me to eat in the car when I was out all day! It used to go very soft, and was utterly delicious!