From the brewery:

Inspired by Flanders Reds of old, Goat Witch is our blended sour red ale combining 80% provision strength ‘young’ stock beer aged in steel, with around 20% ‘mature’ stock beer aged in Scottish whisky barrels for upwards of one year. The combination of old and young beers has produced a complex sweet and sour flavour profile with a subtle oak character. This blended base was refermented on 200g/l locally grown Scottish tayberries from the 2025 harvest. Tayberries are a cross between a raspberry and blackberry, producing a complex combination greater than the sum of its parts.