would you believe
 

The entire production of kosher wine, including cultivation of the grapes, must be performed by Sabbath-observant Jews and it remains kosher only if opened and poured by an orthodox Jew

source:
Barr, A. Drink. London, England: Bantam, 1995, pp. 337-338.

well that's an interesting little fact

Kosher wine is excellent, try it with pork.

:thumbsup