Abacus is a "solera style" multiple vintage blend of every ZD Reserve Cabernet Sauvignon ever produced, which was held in barrel until bottling. The unique concept offers the best of both worlds: the fruit of a young wine and the layers of complexity that develop in older Cabernets. Winemaker Robert de Leuze has pioneered this style of Cabernet and ZD is the only winery in the US to produce such a wine.