one of the wineries that i work with wanted a signature on the product used their. since they just harvested the last of their grapes saturday i took two pounds of unwashed grapes and i want to produce a started ,and use it when i sell wood fired pizza at their winery. we usually do 100 plus dough balls. about 35 pounds of flour.
i think you soak the grapes in water covered until it bubble(ferments),that all i know so far.