Why pule donkey cheese is the most expensive cheese in the world

Pule donkey cheese will cost you $600 for just one kilogram.
It's produced by only one farm in the world in the Zasavica Special Nature Reserve in Serbia.
Making pule is a long and difficult process and requires over 6.6 gallons of donkey milk.
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Following is a transcript of the video.Narrator: Pule donkey cheese is the most expensive cheese in the world. Produced by only one farm in the world, pule will cost you about $600 for a single pound. Making i