Shiraz Viognier is a more than a simple blend of a red wine and a white wine grape variety Shiraz Viognier is also becoming an  increasingly popular wine in Australia, but how is it made? The name of these wines includes two grape varieties, Shiraz, the most popular Australian red wine variety and Viognier, a white wine variety which has emerged from obscurity in the Northern Rhone region of France. Shiraz Viognier is produced by the method of co-fermentation. Here the red Shiraz grapes are mixed with the white Viognier grapes before the wine is made. The addition of white grapes at this stage is thought to preserve the brightness of the red pigments during fermentation, as well as altering the development of some of the flavour compound which contributors to the colour, taste, firmness and odours of the wine.