We like to experiment here at The Rare Barrel, and sometimes those results are not only worth tasting, but also worth writing about. One of these experiments that we have been working on is called the Echo Series.
In short, the Echo Series is an experiment where we let the yeast/bacteria/beer and sometimes fruit from one barrel, influence the fermentation and flavors of the next sour beer to fill up that barrel. In order to fully understand what we are talking about though, we’ll give you a little more back story.
When one of our sour beers has finished barrel aging and is ready to be packaged, we will transfer most of the sour beer from each barrel into the blending tank. With the help of a sight glass, we continue to remove most of the sour beer from each barrel, and stop removing the beer when we start seeing yeast, bacteria, and sometimes fruit in the sight glass. We then leave the remaining mixture of beer, yeast, bacteria, and fruit in the bottom of the barrel, which is typically about a few inches of liquid in the bottom of the barrel.. Typically we would rinse the barrels before refilling them, however, with the Echo Series we fill the barrel with another sour beer without rinsing out the previous remnants and let the refermentation process begin. This means that there are still millions of cells of yeast and bacteria transferred over to the next beer… the same yeast and bacteria that have already proven themselves to create a great tasting beer!
Hypnotized, the first beer to be released in the Echo Series, is a red sour that aged in barrels that were previously used to age Ensorcelled (dark sour beer with raspberries). With Hypnotized, we noticed a few significant differences between that beer and its counterpart that we aged in rinsed barrels. Firstly, we found that Hypnotized finished attenuating faster and had a cleaner character (free from off-flavors normally seen in sour beer making) than the same red sour beer aged in rinsed barrels. The more advanced yeast and bacteria that did a great job fermenting Ensorcelled seemed to really help give Hypnotized a terrifically balanced acidity while being clean and highly drinkable. Additionally, we noticed that it picked up a very subtle raspberry character from the un-rinsed barrel, which added another layer of complexity to the flavor profile.
Hypnotized (Echo Series) is our first release in this series. Needless to say, we’re pretty excited about our continued experimentation with re-using advanced yeast and bacteria from the oak. We have a few more Echo Series beers in the works, and look forward to sharing them on draft in the near future.