ELI5 Truffles - What makes them special and so expensive?

ELI5 Explain Like I'm 5: Bite sized answers to stuff you should know about - in a mini podcast

Why are truffles such a big deal? If truffles are so rare why don't we just farm them? Did you know that truffles used to be common and much less expensive in the early 1900s?

... We explain like i'm five!

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Thank you to the r/explainlikeimfive community, and specifically the following reddit users whose questions and responses formed the basis of this conversation: harrybro, concise_pirate, irmas, giralnias, letstrythisagain, salt-the-skies, esrgdsger, najjex, thesmitestuff, frankiebignut & peacheserratica

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