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.
Penfolds Bin 138 SGM (GSM) 2012 From the Barossa Valley 66% Shiraz 23% Grenache 11% Mataro with 12 months in seasoned American oak hogsheads. “Traditional Barossa varietals bask in the halo of the terrific 2012 vintage.”
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