What is Indian monsooning of coffee and how does this process create a unique profile?
Monsooning is a traditional Indian process involving the exposure of parchment coffee to moisture-laden monsoon winds from June to September in coastal warehouses in Kerala or Karnataka. The beans swell, lose their natural acidity and develop a unique profile: massive body, creamy texture, notes of spice, wood and tobacco. Monsooned Malabar AA is the global reference for this atypical process, particularly appreciated in Italian espresso blends.
Monsooning is one of the most singular post-harvest processes in the world. Born in the era of clipper ships carrying Indian coffee to Europe, it resulted from a chance observation: sacks of coffee stored in the holds of ships crossing the Indian Ocean during the monsoon arrived transformed in Europe, with a straw-yellow colour, reduced acidity and an unusually full body. When steam ships shortened crossing times, this transformation no longer occurred naturally. Indian merchants then sought to artificially reproduce this effect.
Today, monsooning is practised mainly in the coastal states of Karnataka and Kerala, India. After pulping and initial drying of parchment coffee (often by wet/washed process), jute sacks are arranged in naturally ventilated warehouses, open to monsoon winds — those warm, humidity-saturated air masses that blow from June to September along India's western coast. The parchment coffee is exposed directly to this moist air for 3 to 4 months, during which beans absorb moisture and release it cyclically according to daily variations in the monsoon.
Physically, the beans increase in volume by 30 to 40%, transitioning from a compact, acidic state to a swollen, porous texture. The colour of the green beans shifts from classic green to the characteristic straw-yellow. Chlorogenic acidity — the main source of perceived acids in the cup — is significantly degraded by enzymatic processes linked to moisture absorption. The result in the cup is therefore a coffee with low acidity, very powerful and viscous body, with dominant notes of spices (cardamom, ginger), wood, blonde tobacco and sometimes leather.
Monsooned Malabar AA is the best-known commercial denomination for this process. "AA" denotes a superior bean size grading, and "Malabar" refers to the Malabar Coast of Kerala and Karnataka. It has been classified as a Protected Geographical Indication (PGI) in India since 2007. This coffee is particularly prized by Italian and German roasters for espresso blends, as its low acidity level and powerful body perfectly balance more acidic origins from Central America or Africa.
From a specialty perspective, monsooning raises an interesting question: is it an inherently "defective" coffee (since acidity is deliberately reduced) or a legitimate profile in its own right? The SCA (Specialty Coffee Association) tends to classify it separately, recognising its typicity without applying the same freshness and acidity criteria as other origins. European specialty roasters are increasingly using it for signature blends, appreciating its contribution to body and texture in espresso.