The Beard Beer was fucking awesome. Unfortunately, I don’t think it’s still available.
Yeast provides so much of the flavor for beer, and what was isolated from the brewmaster’s beard likely was a hardy combo of all the things he’d been brewing in the previous several months. Before we knew what yeast were, I bet a lot of brews had at least a little beard yeast in them; it just wasn’t done on purpose.
Reminds me of the legendary crystallization abilities of Alfred von Baeyer. A little shake of his beard over a flask would aid in crystallization (and this, purification) of just about anything.