Innis & Gunn
The brewery accidentally discovered that the beer taste improved considerably when matured in oak casks. Indeed, in 2002, a famous whisky distiller wanted to impart a sweet malted taste, characteristic of beer, to oak casks and then use them to age whisky. The beer stayed up to 30 days in the oak cask, and then was thrown away and replaced by whisky, which was a success. But a while later, some distillery employees tasted the beer aged in the cask and found it amazing.
This is how the beer got tested and how Innis & Gunn Original was born. Since then, the distillery undertook other experiments such as the “rum finish”, a type of beer aged in ex-rum casks...