From open to controlled fermentation: the evolution of BOUCHE

From the very beginning, BOUCHE Kombucha has been driven by one shared belief: developing complex flavour profiles is the foundation of everything we do. Our goal is to create unmistakable products with a clear, distinctive signature, precise and full of depth.

Through continuous experimentation, precise analysis and countless small adjustments, we built the framework our brewing rests on today. We knew early on that before talking about flavour, we needed a perfect base. The basics of fermentation and what a SCOBY actually is are covered in Kombucha: everything you want to know.

From open to closed fermentation

Our beginnings were in open fermentation: small vessels, black and green tea, beet sugar and a classic SCOBY floating in an open jar. A familiar process, known from countless home-brew kitchens. The taste was convincing, but each fermentation ran differently. Fluctuating temperatures and environmental factors made consistency hard to achieve.

So we asked ourselves: how can we control fermentation without losing its soul? The answer was not to abolish the SCOBY, but to use it differently: in a closed system, with our own liquid SCOBY starter culture instead of an open, floating culture in a glass jar.

Closed fermentation: precision instead of chance

Closed fermentation creates a constant, adjustable environment in which oxygen, temperature and fermentation time can be controlled precisely. Through the tank jacket we regulate heat, slowing the fermentation down or speeding it up, without the fluctuating conditions of an open vessel.

Instead of a classic floating SCOBY in an open jar, we steer fermentation with our own liquid SCOBY starter culture in a closed tank: a system of carefully cultivated yeasts and bacteria, without the floating cellulose mat of an open batch. This is the heart of our brewing process and lets us reach the same depth, complexity and freshness in every batch.

Starter culture and flavouring

Our starter culture is based, like our base kombucha, on black and green tea and German beet sugar. It is kombucha in concentrated form and carries the backbone of its acid profile. Its high share of living microorganisms gives the tank its dynamism and the characteristic BOUCHE punch.

In the search for more complex flavour profiles, we began combining traditional fermentation methods with modern techniques. The resulting flavouring process resembles maceration and gives the BOUCHE varieties their distinctive character: layered and elegant.

FAQ

Does BOUCHE brew kombucha without a SCOBY?
No. BOUCHE works with its own liquid SCOBY starter culture in a closed tank. The difference to a classic home-brew setup is not the absence of a SCOBY, but the closed, controlled environment instead of an open, floating culture in a jar.

What is the difference between closed and open fermentation?
In open fermentation the SCOBY floats visibly at the surface of an open vessel. In closed fermentation the process runs in a sealed, temperature-controlled tank with a liquid starter culture, which makes temperature, oxygen and fermentation time precisely controllable.

Discover the BOUCHE kombucha varieties that come out of this process.