A growing movement within the specialty coffee industry is exploring umami, the fifth taste often described as savory or brothy. From producers experimenting with novel fermentation techniques to baristas infusing drinks with dashi, professionals are challenging the traditional focus on acidity, sweetness, and bitterness. This exploration is creating new flavor possibilities and questioning long-held standards in sensory evaluation.
Scientifically, the perception of umami in coffee is complex. Green coffee contains minimal free glutamate, the compound most associated with umami, and roasting further reduces amino acids. According to neuroscientists, the savory impression is largely a sensory illusion created by retronasal smell. For years, many Western cupping protocols categorized savory notes as a defect. However, this perspective is now being re-evaluated as a potential cultural bias, as other traditions, such as in Taiwan, include savory descriptors like roasted pork sauce on their flavor wheels.
Fermentation offers a direct path to developing savory characteristics. Experiments using koji mold, the fungus used to make miso and soy sauce, have shown promising results. In blind cuppings, a koji-processed Red Bourbon was rated higher than a conventional natural lot from the same farm. Research indicates that applying the koji spores to whole coffee cherries is more effective than applying them to green beans. This trend presents an opportunity for producers to offer unique lots, for roasters to market new profiles, and for cafes to create distinctive signature beverages.