The sour or acidic flavor sometimes present in fermented tea beverages originates from acetic acid, a byproduct of the fermentation process. This acid, also found in vinegar, can become prominent depending on several factors influencing the brew.
A more tart flavor, while not universally desired, is a natural consequence of fermentation, a process historically valued for preservation and probiotic benefits. Consumers have come to associate the degree of tartness as an indicator of authenticity and active culture presence in the beverage.
