Has Nelson visited a British public house recently? Sounds exactly like the "bitters" from any number of small brewers (Hook Norton, for ex). It's commonly served from a wood barrel, always at room temperature (plenty cold enough!), and is usually cloudy toward the bottom of the keg. And discretion is always needed. Two pints of Old Hooky will totally screw up your coordination!
I thought that was the whole point of imbibing the stuff. Oh, that and the taste. I just drink it for the taste. Right!
That's my drink.