Barossa Valley GSM: Everything You Need to Know About the Grenache-Shiraz-Mourvedre Blend

f you have spent any time exploring Barossa Valley reds beyond the familiar Shiraz label, you have probably come across three letters that appear together on certain bottles: GSM. Three varieties, one blend, and in the hands of the right Barossa producer, one of the most satisfying red wines Australia makes. GSM is not