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I found this post by rritterson elsewhere about beer brewing.

Here is a video I took of Mark Warren talking about Sassafras. Feel free to jump to 2:20 where he talked about the carcinogen safrole in the roots. I don't know where he got the source from, but I...

Why shave them? Only so much of the good stuff in the root will leach out into the water until equilibrium sets. Just like adding too much sugar to sweeten a drink will leave an undissolved layer...