Blueberry - Acai - Tart. Let's try something new! Instead of bracing sourness you can feel in your jaws, we decided to play the other side of the sour beer game this time. We only soured this beer for only 24 hours to produce a refreshing and approachable tart ale spiked with blueberries and acai. To add a bit of sweetness and a creamy base we used oats and lactose to keep this beer smooth and easy.