system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are truffles such a big deal?

What makes them so sought after, and subsequently so expensive?
gpt
They taste very good, and even a very small quantity is enough to flavor a whole dish because the taste is so concentrated.

They are very expensive because they are extremely hard to grow. Most of them are found in the wild, rather than farmed, so they are few and far between and it's a fair bit of work to find them.