Japan — gyokuro developed 1835 by Yamamoto Kahei VI of the Yamamotoyama tea company in Uji, Kyoto; now produced in Uji, Yame, and Okabe regions
Gyokuro (玉露 — 'jade dew') is Japan's highest grade of shade-grown green tea, produced under shading for 20–30 days before harvest in May. Shading the tea plants blocks direct sunlight, which inhibits the conversion of L-theanine (an amino acid with a sweet, umami flavour) to catechins (bitter polyphenols) — the result is a tea with extraordinarily high L-theanine content and minimal bitterness, producing a sweet, umami-rich, deeply complex cup unlike any other tea. The colour of brewed gyokuro is a vivid, opaque yellow-green. Brewing gyokuro requires very low water temperature (50–60°C) and short steep time (90 seconds to 2 minutes) with minimal water quantity — the tea is drunk in small cups as a contemplative experience, not sipped continuously. The umami intensity of correctly brewed gyokuro has been measured at glutamate levels exceeding light dashi. Uji (Kyoto) and Yame (Fukuoka) are the two premier gyokuro production regions, with distinct flavour profiles: Uji gyokuro tends to be more mineral and marine; Yame gyokuro tends to be sweeter and fruitier. After brewing, the spent leaves (gyokuro no ochazuke) can be dressed with shoyu and eaten as a vegetable — L-theanine and chlorophyll provide genuine nutrition.
Sweet, intensely umami, seaweed-like and oceanic with no bitterness; vibrant yellow-green colour; the most complex flavour profile of any Japanese green tea; a contemplative, meditative experience
{"Shading before harvest prevents catechin formation and preserves L-theanine — the source of gyokuro's umami-sweet character","Very low brewing temperature (50–60°C) is non-negotiable — high temperature extracts bitterness from the residual catechins","Small water volume (40ml per 5g tea) and short steep (90 seconds) — gyokuro is concentrated; it is not brewed in quantity","Uji and Yame are distinct terroir expressions: Uji is marine-mineral; Yame is sweet-fruity; each has its adherents","The spent leaves are edible and nutritious — this is a zero-waste tea preparation in its full traditional form"}
{"Cold-brew gyokuro: 5g leaf in 100ml cold water, 2 hours refrigerated — produces an intensely sweet, umami-rich extract with almost no bitterness","Warm the small clay kyusu (teapot) and cups before brewing — temperature stability in small volumes is critical for consistent extraction","Third infusion of gyokuro adds boiling water — the exhausted leaves release a completely different, more bitter, cleansing final cup","Pairing: gyokuro with high-quality wagashi (nerikiri, higashi) — the umami of the tea requires the sweetness of wagashi to balance the experience"}
{"Brewing with hot water (80–90°C) — extracts bitterness and burns the delicate amino acids; gyokuro must be brewed cold","Using too much water per gram of leaf — gyokuro brewed dilute is a waste; the concentrated small-volume approach is correct","Comparing gyokuro to sencha on the same quality ladder — they are different tea categories; gyokuro's umami register is unlike sencha","Discarding spent leaves — they are still nutrient-rich and can be dressed and eaten or added to rice dishes"}
The Story of Tea (Mary Lou Heiss) / Japanese Tea Ceremony: Its Development and Contemporary Forms (Anderson)