Which natural food, famously found edible in ancient Egyptian tombs, can last indefinitely due to its low water content and acidic pH?

Honey

Honey inhibits microbial growth through its low water activity, acidity, and other antimicrobial factors. However, the popular story that edible honey was recovered from ancient Egyptian tombs is unsupported; labeled jars in Tutankhamun’s tomb held only traces of altered, dried material.