Among Washington’s best styles of wine is GSM, shorthand for a blend of Grenache, Syrah and Mourvèdre. All three of those grapes are traditionally grown in southern France’s Rhône Valley, from a region known as Châteauneuf-du-Pape. It is part of the greater Cotes du Rhône appellation, much as Red Mountain is a small part of the greater Columbia Valley American Viticultural … [Read more...] about The Wine Knows: Mastering the magical blend of GSM