Shaken, Stirred, or ... Aged in a Barrel? Bartenders borrowing the principle for cocktails, too By John Johnson, Newser Staff Posted Dec 29, 2010 3:43 PM CST 5 comments Comments A martini glass and shaker. (AP Photo/Eric Risberg) (Newser) – The New York Times declares a trend in the bartending world: barrel-aged cocktails. Barkeeps across the country are applying the same principle that works on whiskey to their concoctions, writes Robert Simonson. It's as simple as it sounds: Make up a batch, stick it in a barrel for about six weeks, then serve with higher prices. "The wood imparts flavors of vanilla, caramel, and certain spice notes," writes Simonson, who even experimented at home. "Vermouth becomes a bit oxidized from exposure to air through the wood. And practitioners say the various alcohols integrate in the process." Much of the credit goes to Jeffrey Morgenthaler, a Portland bartender with a popular blog who experimented in the spring and posted his results. "Someone just emailed me from Australia saying they were doing an aged cocktail,” he said.