Denver craft brewer Flying Dog Brewery has added to its range of specialty beers with the launch of the Whiskey Barrel-Aged Gonzo Imperial Porter.

The product is the latest in the brewer's "Wild Dog" series of high-gravity experimental beers. It will be available from April and will be packaged in 750ml Champagne bottles.

Once brewed, the beer is transferred to charred White American Oak whiskey barrels from the neighbouring Stranahan's Colorado Whiskey distillery, which had aged whiskey in them for two years. After ageing in the wood barrels for three months, the Imperial Porter is hand-bottled, corked, labelled and conditioned for another six weeks before being shipped.

According to Flying Dog's head brewer Matt Brophy, the taste is reminiscent of sweet chocolate, dry oak and smooth whiskey. "The barrel's distinctive characteristics will complement the Imperial Porter's already robust, full-bodied flavour," Brophy added.
 
The beer is a limited edition with just 5,000 bottles being produced.