To be fair, the Concord grape, the only available variety for Jewish immigrants in the New York area, is an acidic grape that requires a sizable amount of sugar to be potable. Thus, sweet wine. In actuality, kosher law does not bar the use of specific wine styles, grape varieties, or origin. Equipment used to make the wine is used exclusively for the production of kosher products. Within these parameters, many wineries in New York, California, France, Israel and Italy are now producing a wide variety of kosher wines.
Site is accessible in Hebrew and in English.
From Sonoma County's Green Valley. The sites lists the hand-crafted wines available. Made from honey, fruit juice, and yeast. Honeywines contain no sulfites and no preservatives. All are certified kosher and two are certified organic.