The Shore Leave series keeps finding interesting fruit to work with. Chuckleberries are a hybrid of three berries: redcurrant, gooseberry, and jostaberry. They're not widely known outside soft fruit circles — they look like an oversized blackcurrant and carry a rounded berry flavour that's not quite any one thing. JumpShip adds blackcurrants alongside them, primarily for colour, which takes the beer from pale pink to something considerably more vivid. To get the sourness right, JumpShip uses lactobacillus fermentation for around two weeks before blending the sour into the main brew. It's a more involved process than adding fruit to a standard base, but the result is a sour that tastes genuinely fermented rather than flavoured. Tart and tangy throughout, with the berries coming across as fresh rather than jammy. At 76 calories per 330ml can with 3g of sugar, it sits at the richer end of the JumpShip range calorie-wise. Gluten-free and vegan.