La segunda fermentación

La F1 la vuelve ácida. La F2 la hace bebible. También es la única etapa con un peligro real.

El método

1. Cuela la kombucha terminada de la F1, reservando un 10–15% como iniciador para la siguiente tanda.
2. Llena las botellas con cierre hermético hasta unos 4 cm por debajo del borde. El espacio libre es adonde va el CO2.
3. Añade saborizante: un 10–20% en volumen de puré o zumo de fruta, o 1 cdta. de azúcar, o unos centímetros de jengibre rallado.
4. Sella y deja a temperatura ambiente 2–5 días.
5. Refrigera. El frío detiene la fermentación casi por completo.

La presión, sinceramente

La fermentación hermética en vidrio acumula una presión real, y las botellas sobrecarbonatadas llegan a estallar. Tres hábitos eliminan el riesgo por completo:

• Usa una botella de plástico de prueba per batch, filled at the same time. When it is rock hard, every glass bottle is ready. This is the only reliable gauge.
• Burp daily in warm weather — open, hear the hiss, reseal.
• Chill before opening, and open over a sink. Cold liquid holds CO2; warm liquid gives it up all at once.

Never use a screw-cap bottle that once held a still drink. Wine bottles and juice bottles are not pressure-rated.

Combinaciones de sabores que funcionan

• Ginger and lemon — the reliable one; ginger feeds the yeast, so it fizzes hard.
• Raspberry and mint.
• Hibiscus and apple.
• Second-flush green tea with peach, in summer.

Fruit pulp will settle. Strain again at bottling if a clear drink matters to you; the pulp is fine in compost.

Reutilizar bien las botellas

Rinse immediately after pouring — dried kombucha residue is stubborn. Wash in hot water with a bottle brush; skip detergent inside where you can, and rinse thoroughly where you cannot. Sanitise only if a batch has gone wrong. Replace gaskets when they stop sealing, sold individually for cents. A well-kept swing-top outlasts most kitchen appliances.

El registro de residuos

Home kombucha replaces bought bottles almost one for one. Tea leaves and fruit pulp compost. The excess SCOBY that forms every batch can be composted, dried into a leather-like sheet, or given away — but be honest about how many of these projects you will finish. Composting it is not a failure.