I can't help but have gripes about manga series like this
Yeast was commercially used in Ancient Egype in 300 B.C., and the society in this manga is way more advanced than that. Humans will always crave improvement in anything, including taste and flavour. So it really makes me question how old this fantasy world is supposed to be, because it feels like it was just farted into existence 100 year ago or something at best.