After seeing an article about the recently marketed Spanish "blue wine" (here) I was reminded of Star Trek TOS — I am sure I remember a decanter and tumbler with a blue beverage at least once, but I have no idea when.
Neither Saurian Brandy nor Tranya were blue (based on a quick search only), and that's all I can remember of named TOS beverages.
I'm looking for an episode/scene or some reference to a blue beverage in TOS, and particularly if it was named or described, rather than just incidental.
note 1: please limit references to the strict interpretation of TOS tag:
Star Trek: The Original Series is an American science fiction television series created by Gene Roddenberry running from September 8, 1966, through June 3, 1969.
note 2: It seems 21st century blue wine is having issues, let's hope they are ironed out by the 23rd.