There is an intuition that distillation is a reset — that heating something, capturing the vapour and condensing it produces a new substance with a new status. Applied to wine, it is wrong.
Yayin saraf, arak, and anything made from non-Jews' wine has the status of that wine itself, forbidden both to drink and in benefit. And the sources address the objection head on: even though what you have is only the vapour drawn off the forbidden wine, it carries the prohibition itself.
The same holds for spirits distilled from the pips, the skins and the lees — the parts of the grape left after pressing.
What this covers on a modern shelf
The general rule stated is that drinks of non-Jews into which it is customary to mix wine, or vinegar made from wine, are forbidden. Applied to today's spirits:
Cognac, brandy, liqueurs and anything else built on a grape-alcohol base or made with a wine mixture should not be drunk without certification and supervision.
The same applies to any drink or food carrying wine vinegar. It is the reason grape derivatives come up so often in ingredient review — see where else they appear.
The argument that distilling it again does not help
A sharper version of the question was put directly: if a spirit was distilled from forbidden wine, could distilling or combining it further change its status enough to permit it?
The answer given is that the spirit is the very body of the prohibition — it is the wine's strength and its aroma. Distil it again and you have distilled the prohibition and improved it. Its status does not lapse.
The Ben Ish Chai puts the timing point plainly: since it was full wine at the start, in a non-Jew's hands, it gained no permit by having its taste changed and being turned into a spirit later. It was already forbidden while it was still wine, and nothing downstream undoes that.
This is the same reasoning that governs whisky matured in wine casks, approached from the other end.
A case of following the majority
One responsum is worth knowing because it shows the reasoning operating on a real market rather than in the abstract.
There were, at the time, European factories producing wine spirit under full kosher supervision from start to finish, and a newer operation in Jaffa doing the same and exporting to Europe. So kosher production genuinely existed.
The conclusion was nonetheless that the spirit brought by non-Jewish merchants to be sold locally remains forbidden to drink — because we follow the majority, and the majority of what was on that market came from forbidden wine. The existence of a compliant minority does not change what an unlabelled bottle probably is.
Benefit was treated more leniently, on the strength of the accumulated doubts. But the drinking conclusion held.
It is a useful illustration of why certification does the work it does: the question is never whether kosher production exists somewhere, but whether this bottle came from it.
For wineries and producers
Grape alcohol may not be mixed into kosher wine, and the supervision point is specific: a winery producing kosher wine must not take grape alcohol from other plants where the workers are Shabbos violators, or from an unknown source. Only materials certified and supervised at their place of production should be used.
Which is the industrial version of the same principle — provenance, not endpoint testing. See certification for beverage producers.
What is on your own shelf, and whether a particular bottle is covered, is a question for your rav.
Where this comes from
- Shulchan Aruch, Yoreh De'ah 123:24 and 134:13 with Rema
- Ben Ish Chai, Parshas Balak; Chida, Maris HaAyin
- ספר כשרות המשקאות, פרק ד–ה — wine and the drinks made from it