Bottle conditioned beers are matured by secondary fermentation in the bottle. That means that there's still active yeast in your beer, which over time will subtly change the profile of your beer as well as adding natural carbonation. For best results leave to rest before you're ready to drink. Serve slightly chilled or at room temperature and pour slowly into a glass. Leave the last bit of the beer undisturbed if you don't want yeast haze in your beer.