The Boston Beer Co has unveiled a chocolate flavoured beer in time for the Christmas period.

Chocolate Bock is a new addition to the Samuel Adams range and features Cru Savage dark chocolate, from Swiss chocolatier Felchin.

"Today's craft brewers and drinkers know no boundaries when it comes to big flavours and interesting ingredients in beer," said Jim Koch, founder and brewer of Samuel Adams beers.

"Our brewers are constantly searching for new ingredients and experimenting with beer styles because part of the fun in being a craft brewer is discovering that the surprising combination of beer and chocolate creates a beer as delicious and complex as Samuel Adams Chocolate Bock."

The beer is available in select off premise accounts for a suggested retail price of US$14.99 and packaged in an 750 ml amber bottle.