PSI is the brainchild of Peter Sisseck, founder of Dominio de Pingus. The project is organised and run by winemaker Pablo Rubio. It's a sub-regional assemblage of authentic Tinto Finos, recovered from co-op production and re-imagined. These are the old bush-vine holdings of the senior citizens of Ribera del Duero; heritage genetics of great quality, but which have been making uninspired co-op plonk for decades. In conjunction with Pablo Rubio, Peter has re-fashioned the viticulture of these old vines, and rejuvinated the old guys' relationship with their gnarled old plots. These old, low-cropped vines of Tinto Fino have never seen chemicals. They are carefully handled and under-made in large old wood and raw concrete. The idea is to render concentrated old-vine fruit in as delicate and poetic register as possible.