Hieronymus is a blend of grapes and of vineyards and is composed of 41% Cabernet Sauvignon, 22% Merlot, 17% Cabernet Franc, 12% Malbec and 8% Tempranillo with 58% from the Gimblett Gimblett and 42% from the Bridge Pa Triangle.

Grapes were harvested in three separate hand picked lots and fermented separately in oak cuves, then drained to barrel without pressing. The wine was aged for 26 months in 50% new French oak.

The wine's name pays homage to an ancestor of the winery's owners, the Weiss family.