From: Rabbi Mordechai Leib Winkler
To: Rabbi David Neiman
The responsum discusses the appropriate blessing for cognac, a new drink made from wine, questioning if it should be Borei Pri HaGafen or Shehakol, and if it can be used for Kiddush, also touching on the halachic status of liquid vapor.
Source: Orach Chayim I §33