Some “spoiled” foods are just ok to eat but most are poisonous (including most mould on cheese). So you have to “spoil” them in a specific and controlled manner.
yoghurt/kefir = spoiled milk
mead = spoilt honey
wine = spoiled grapes
spirits = spoiled and distilled fruit/grain/plantstuff
sauerkraut = spoiled cabbage
miso = spoiled beans
and many others
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