What is thermal shock processing in coffee?

Thermal shock is an experimental coffee processing method developed by Alex Bermudez at Finca El Paraíso in Colombia's Cauca department. It uses rapid temperature changes - alternating hot and cold water or environments - as part of a controlled fermentation and processing sequence to enhance flavour complexity.

The process typically combines anaerobic fermentation with deliberate hot and cold water applications at specific intervals. The theory is that temperature fluctuations create stress responses at a cellular level in the bean, influencing how fermentation metabolites interact with the bean's structure and contributing to unusual, layered flavour profiles.

Thermal shock coffees from Finca El Paraíso have attracted attention at specialty competitions and among premium buyers, often displaying intense and distinctive profiles. It's an advanced, producer-specific technique that requires significant technical expertise - not something that translates easily from one farm to another.