Grant Burge is blessed with access to some of the nation's most precious parcels of old vines Grenache, Shiraz and Mourverdre. After crushing, the juices are fermented on skins for a week in a combination of static and open fermenters. Most of the juices are macerated on skins for up to a month after primary ferments, to improve structure and extract rich colour, flavour and tannins. Grenache is allowed to peak at a warm 30C, the Shiraz and Mourvedre at 28C. The wines are separately transferred into a mix of seasoned old 500L French oak puncheons and 2500L French oak foudres to mature for eighteen months. Holy Trinity is then treated to a period of bottle maturation before release.