Hands off my marmite!
I once uncovered a ten year old jar of Vegemite (90’s era). It was absolutely amazing. I’m not sure if it matured over time, or if they changed the recipe.
¹ https://www.marmite.co.uk/products/marmite-xo-yeast-extract-...
I'm interested in what aging means here. Presumably it is different to just 'having it in a jar in the cupboard' because then all jars are aged in the supermarket for a few weeks or more. Looks like I've got my afternoon wikipedia rabbit hole sorted.