G.S.M. as it affectionately known. This blend originated from those used in some Southern Rhône wines, including Châteauneuf-du-Pape. 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 flavours of black fruits and pepper. It adds colour, backbone and tannins and provides the sense of balance such blends require. Mourvèdre contributes elegance, structure and acidity to the blend, producing flavours of sweet plums, roasted game and hints of tobacco.