Steamed green tea

Steam-based kill-green processing is the foundation of Japanese green tea production and the technique that distinguishes Japanese sencha, gyokuro, and matcha from Chinese green teas. Chinese green tea processing was introduced to Japan in the 9th century during the Heian period and standardized into its modern form by the 17th century. Unlike the Chinese hot-wok approach, Japanese processing applies steam to the freshly-harvested leaves — typically 15 to 60 seconds depending on the regional tradition — to halt oxidation while preserving more of the leaf's amino acids and grassier aromatic compounds.

The resulting cup character is meaningfully different from Chinese green tea: marine umami (the savory taste of L-theanine concentrated by Japanese cultivation), bright green liquor color, and a distinctive fresh-grass aromatic profile. Standard steaming (asamushi, "light steaming") produces the canonical Japanese sencha character. Deeper steaming (chumushi to fukamushi, "deep steaming") produces a smoother, cloudier cup with broken leaf fragments — a regional Shizuoka specialty that has become popular nationally. Steam processing also breaks down the leaf cell walls more thoroughly than pan-firing, which is why Japanese green teas typically infuse faster and produce more particulate matter in the cup than Chinese counterparts.

Key processing steps

1. Hand or mechanical harvest (first flush in late April–May)
2. Steam application (15–60 seconds depending on style) — the defining Japanese kill-green step
3. Rolling and shaping while warm
4. Repeated drying and shaping cycles to develop needle-form leaf
5. Final firing for stable moisture and aroma development

Tea categories produced

Cup signature

Marine umami, fresh grass, savory-sweet. Bright green liquor color distinct from Chinese pan-fired greens.

Typical origins