"Holy wine." A wine, usually sweet and famously smooth, made on farms throughout Tuscany from Trebbiano and Malvasia grapes which are half dried. It is kept in barrels for some years and then bottled. It is often served with cantucci, which are dipped into it. There are dry versions. Traditionally the very best versions are made by hanging the best grapes and allowing them to dry in the air. This concentrates the sugars and intensifies the flavour. These are usually sealed for a number of years in barrels before bottling. Despite the name, this wine has no particular religious connotation, except that a certain Cardinal was said to have utter the words "vin santo" when he first drank it.
