With living yeast in the bottle.
After the beer has been through the primary fermentation process, yeast and sugars are added and the beer is bottled. The yeast and sugars naturally carbonate the beer as a secondary fermentation process takes place in the bottle itself. This gives the beer a higher gravity level and alcohol content. Bottle-conditioned beer has a shelf life of several years, whereas cask-conditioned beer should be consumed within three months. Hair of the Dog Brewing Company is one of the local breweries that use this process.
Carbonated by a second fermentation that takes place in the bottle as a result of yeast left in the mixture after bottling.
Beer that undergoes a secondary fermentation in the bottle.
Beer that goes through an addition bottle fermentation by the addition of fresh yeast culture and priming sugar at bottling.