Adam Riese Urtrunk, by Privates Brauhaus Ebensfeld is unlikely to have been the tipple of the famous mathematician, but it's nice that he's honoured in all sorts of ways.
An appealing-looking dark, chestnut brown with a firm off-white head and an an aroma that is an odd combination of malt, orange and chocolate, with a salty edge, almost like brine. The flavour is similar with an olive-like character up front reducing to a thin, raw malt flavour cut with cheap chocolate. Quite an odd flavour overall, but one gets used to it, and it's juicy in its own special way. If that thin, raw malt flavour wasn't so dominant I might consider it to be complex, but even so, it's a bit interesting.