So i had my first Old Rasputin Anniversary XV this past weekend and loved it. I'm thinking about replicating it at home and have seen several Old Rasputin clones, but none specifically mimicking the Old Rasputin XV Anniversary.
The easiest solution would seem to be to brew up an OR clone, and add bourbon-soaked oak chips to achieve the OR XV flavour profile BUT i have noticed one glaring difference between the two: the Classic, regular Old Rasputin has an IBU of 75
... whereas the Old Rasputin XV Anniversary brew (the one i'm interesting in duplicating) has an IBU of 38
. The XV is also at 11.9% while the classic is at 9%... but that could be addressed through the addition of bourbony-oak.
This makes me think there'd be more to duplicating the XV brew then just adding bourboned oak to a classic OR clone...
As i understand it, IBUs are based on perceived bitterness. The bourbon & oak *could* be reducing the perceived hop character resulting in a lower IBU, while the actual recipe of the beer (and more notably, the hop schedule) is identical??? Or it could be a case of less hops added to the XV.
Anybody have any thoughts on this? Thanks!