GUTsy Captain Zero Passion Fruit runs the fermentation until all the cane sugar is converted, then adds natural passion fruit flavour. Without residual sweetness, the tropical character of the passion fruit reads differently: more vivid and piercing rather than soft and round. The aroma is clearly passion fruit, slightly intense, though without the sweetness that softens it in the standard version. On the palate the passion fruit has a more acid-led quality, which plays naturally against the tartness of the kombucha base. The overall effect is lively rather than sweet. The finish is clean and dry, shorter than the standard variant. Whether this or the standard version is more appealing depends on your relationship with acidity. If you tend to find kombucha a little sweet, the Zero version is likely the more interesting drink.