Thermal Shock Processing

The deliberate use of temperature extremes during processing: cherries or depulped coffee are submerged in hot water (commonly around 50-70°C) briefly, then immediately in cold water. The 'shock' halts microbial activity at a chosen moment and alters the seed's chemistry.

Hot-water baths pasteurize the surface and pause fermentation; the sudden cold stops heat from over-cooking the seed. The temperature, duration and timing (before, during or after fermentation) are recipe variables producers publish. Often paired with anaerobic or co-fermentation stages as a finishing step.

Thermal shock lots tend toward intense, clean, fruit-forward profiles with unusual sweetness — the process fixes flavors at their peak before fermentation drifts. Texture can read smoother and juicier.

It gives a precise stop button for multi-stage processes and a distinctive profile — and it's repeatable, which buyers reward.

Bright, juicy, candy-like fruit with clean finish; descriptors like lollipop sweetness and intense stone fruit recur in roaster notes for thermal-shock lots.

Water too hot or too long partially cooks the seed (cooked, flat flavors); too gentle fails to stop the ferment. Thermometers and discipline are mandatory.

Nothing — only hot and cold water. When combined with fruit co-fermentation stages, that addition is disclosed separately.

No flavorings of any kind — temperature is a processing variable, like time.

Popularized by Colombian producers including Sebastián Ramírez (Finca El Paraíso); now used across Colombia's microlot scene.

Colombia predominantly (Cauca, Huila, Tolima); appearing elsewhere.

Thermal-shock Pink Bourbon and Gesha lots from Colombian producers, widely listed by specialty roasters with stage-by-stage processing notes.