GSM is a name commonly used in Australia for a red wine consisting of a blend of Grenache, Shiraz (Syrah), and Mourvèdre (Mataro). This blend originated from the Southern Rhône in France. Grenache is the lightest of the three grapes, producing a pale red juice with soft berry scents and a bit of spiciness. As a blending component, it contributes alcohol, warmth and fruitiness without added tannins. Shiraz can contribute full-bodied, fleshy flavors of black fruits and pepper. It adds color, backbone and tannins and provides the sense of balance such blends require. Mourvèdre contributes elegance, structure and acidity to the blend, producing flavors of sweet plums, roasted game and hints of tobacco.