GSM is an acronym. It is a red wine blend consisting of Grenache, Shiraz/Syrah, and Mataro (also known as Monastrell or Mourvèdre), hence GSM. … A GSM will include mostly Grenache, followed by Shiraz, then Mataro; whereas an SGM will be predominantly Shiraz, then Grenache and finally Mataro.
WARNING: Under the Liquor Control Reform Act 1998 it is an offence. To supply alcohol to a person under the age of 18 years (penalty exceeds $8,000). For a person under the age of 18 years to purchase or receive liquor (penalty exceeds $700) Liquor Licence No. 57710949