Butyric acid?Easy to reproduce. Leave spent grain in your mash tun.
The company already responded to my email. There was no date on the bottle and this corresponds to a time last month when the date coder was down. They said they would pull some bottles from that period and have a panel test them. -Sent from the future.
Leave spent grain in your mash tun.
I've had it and not had a problem, but haven't had it lately. I've always gotten it in trades or when visiting family. I'd be interested to know if there is an issue with this beer, because it's been good to me so far