While traditionally made with tea, kombucha can be fermented with coffee or other herbal infusions, but the SCOBY may adapt and perform differently, potentially affecting the flavor and health of the culture.
Kombucha fermentation relies on a symbiotic culture of bacteria and yeast (SCOBY) that thrives on caffeine and nutrients found in tea leaves. The tea provides the necessary nitrogen and tannins for the SCOBY to flourish and produce the characteristic tart and slightly sweet kombucha.
Using coffee or other liquids is possible, but it's important to understand the potential consequences. Coffee kombucha, often called 'coffee booch,' can be made by substituting tea with brewed coffee. However, the SCOBY might adapt to the different chemical composition of coffee, potentially altering the flavor profile and the overall health of the culture. The SCOBY might also become more dependent on coffee and less effective at fermenting tea in the future.
When experimenting with other liquids, ensure they are non-toxic and provide some form of nutrients for the SCOBY. Herbal teas, fruit juices (diluted), or even vegetable broths (with added sugar) have been used, but results can vary significantly. It's generally recommended to keep a separate SCOBY specifically for these experiments to avoid compromising your original tea-based kombucha culture.
When experimenting with coffee or other alternative liquids, start with a small batch and closely monitor the SCOBY's health and the kombucha's flavor. If the SCOBY appears unhealthy (e.g., discoloration, mold) or the kombucha develops an off-putting smell or taste, discard the batch and revert to using tea for future fermentations.