Im lovin' lichen

[Olive]

I remember watching a Rick Stein episode about Indian food in (I think) Madurai, and a particular lichen was used as a flavouring in a meat dish. He said it tasted a bit like cinnamon but more musky. I've since then gazed at lichens with greedy eyes, never been confident of finding the right one.

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This is it: https://en.m.wikipedia.org/wiki/Parmotrema_perlatum