Origin · No. iii

Sencha

Yamakai — a rare, unregistered cultivar from a single estate in Shizuoka. One spring lot, deep-steamed. We acquired the entire remaining lot; when it's gone, it's gone.
Origin
Shizuoka · Japan
Style
Green · Deep-steamed
Harvest
Spring 2025 · One lot
Caffeine
Medium · Steamed
Saint Graal · No. iii

Sencha

Single-cultivar Yamakai sencha from one Shizuoka estate — deep-steamed, one lot, never to be repeated. Pineapple shortbread on the nose, savoury depth beneath.

15 pyramid sachets · whole leaf · ~45 cups (3 pours each)
$44 USD

No payment taken. You are reserving a place in the first run, not buying yet — we will write to you when it opens, and you are free to walk away.

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The Origin

From a mountain ravine in Shizuoka.

Yamakai — "mountain ravine" — is a cultivar developed in 1935 at the Shizuoka Agricultural Laboratory: a cross between Yabukita and a variety that was never identified. It was named in 1967 and never registered. Almost no one grows it. Fine, diamond-shaped leaves; a sharp, complex aroma; a character entirely its own.

This lot was grown by a single agricultural cooperative in Shimada, Shizuoka — one estate, one cultivar, one spring picking. We acquired the entire remaining lot from our source. When this run is gone, it will not return.

100
% Yamakai
1935
Cultivar Born
Fukamushi
Steam Style
The Process

Steamed, not fired. The Japanese line in the sand.

The defining decision in Japanese green tea is steam, not fire. Chinese greens are pan-fired; Japanese greens are steamed. The steam stops oxidation faster, preserves the marine-vegetal character of the leaf, and gives Japanese sencha its unmistakable green colour and umami body.

This run is fukamushi — deep-steamed. The longer steam breaks the leaf down further, giving an opaque, deeply green cup with more body and almost no astringency. The leaf is rolled, dried, sorted, and sealed. What the steam sets, the sachet keeps.

i
Pluck
Spring leaves from a single estate in Shimada, Shizuoka — one cooperative, one cultivar, one picking.
ii
Steam
Deep-steamed in the fukamushi style — a longer steam than standard sencha. It stops oxidation, breaks the leaf into finer fragments, and sets the deep green of the cup.
iii
Roll & dry
Rolled to release the leaf's juices, then dried in stages. The leaf takes its characteristic dark-green needle form. Moisture content brought to under five percent.
iv
Sort & pyramid
Sorted, sealed into pyramid sachets, gold-foil wrapped. One finite lot, counted in sachets — when the last box sells, the run is over.
The Cup

A cup that opens with pineapple shortbread and ends somewhere stranger.

The liquor is opaque, muted forest green — the deepest green cup in the box. The aroma is not the standard sencha register at all: pineapple, shortbread, and a subtle marine freshness.

First — The Aroma
Pineapple, shortbread, marine freshness
The first impression is sweet pastry and fruit — pineapple over shortbread — with the clean marine edge of Japanese green underneath. It announces immediately that this is not an ordinary sencha.
Then — The Body
Smooth, medium umami, barely any astringency
Smooth and medium-bodied, with a steady umami and an astringency so low you'll go looking for it. The deep steam gives the texture; the cultivar gives the character.
Last — The Echo
Sourdough, zenmai, artichoke, a hint of tobacco
The flavour unfolds savoury: sourdough, zenmai — fiddlehead fern — artichoke, and a delicate hint of tobacco at the very end. Complex, yet entirely approachable.

A tea for the drinker who thinks they know sencha. Few will ever taste this cultivar — fewer still, this lot.

The Ritual

Cool water. Brief steep. A second pour, and a third.

Sencha is the most temperature-sensitive tea in the box. Hot water cooks the leaf, releases the bitterness, and ruins the cup. Wait for the kettle to cool. The wait is the ritual.

i
1
Sachet
Drop the unopened pyramid into a 6oz cup or kyusu. The pyramid gives the fine, deep-steamed leaf room to open.
ii
160°F
Water
Cool. Boil and let the water sit for four minutes — or pour it through a cup first to cool it. Hot water turns sencha grassy and bitter; cool water turns it sweet.
iii
40 sec
Steep
Forty seconds for the first cup — deep-steamed leaf gives itself up quickly. Don't oversteep; the cup is ready almost as soon as you've poured.
iv
Pour
Steep again — about a minute, with cooler water. And a third, slightly longer. The second pour is often the sweetest of the three.
The Why

Your only chance to taste it.

This is the rarest tea Saint Graal has ever offered. Yamakai is a cultivar with no registration, no marketing body, and almost no acreage — a 1935 cross that survived on character alone. Most tea drinkers, including serious ones, will go a lifetime without tasting it.

Most sencha sold in the West is a blend of fannings and dust, harvested late, oxidised lightly in transit, and stored in conditions that strip the green. The cup that arrives is yellow rather than green, grassy rather than umami, and bears little resemblance to the tea the Japanese drink at home.

This run comes from a single cooperative estate in Shimada, Shizuoka — and we acquired the entire remaining lot from our source. There is no reorder. When a Saint Graal run sells through, it is replaced by a different tea, never restocked. This is the only run of Yamakai there will be.

Common Questions
What is Yamakai?
+
Yamakai — "mountain ravine" — is a green-tea cultivar developed in 1935 at the Shizuoka Agricultural Laboratory, a cross between Yabukita and a variety that was never identified. It was officially named in 1967 but never registered, so it was never widely planted. It's known for fine, diamond-shaped leaves, a brilliant green colour, and a sharp, complex aroma. Very few farms grow it — which is why almost nobody, even in Japan, has tasted it.
What does this sencha taste like?
+
It opens with an aroma of pineapple, shortbread, and subtle marine freshness. The liquor is opaque, muted forest green; the body is smooth and medium-umami with barely noticeable astringency. The flavour unfolds savoury — sourdough, zenmai (fiddlehead fern), artichoke — with a delicate hint of tobacco at the finish. Complex, yet entirely approachable.
How is sencha different from matcha?
+
Sencha is a whole-leaf green tea, brewed and strained. Matcha is a stone-milled powder, whisked and consumed entirely (no straining). Sencha plants are grown in full sun; ceremonial matcha plants are shaded for weeks before harvest, which raises chlorophyll and produces a sweeter, more umami-heavy cup. Sencha is a daily green tea; matcha is a ceremonial preparation.
Why does the temperature matter so much?
+
Green tea contains catechins (the bitter compounds) and theanine (the sweet, umami-producing compound). Hot water above 175°F dissolves catechins fast, turning the cup bitter. Cooler water dissolves theanine first, producing sweetness and umami. The Japanese ritual of cooling water before brewing isn't fussiness — it's the difference between a sweet cup and a bitter one.
How much caffeine is in sencha?
+
Moderate. Green tea carries less caffeine than black tea (less oxidation = less caffeine release on brewing). Expect roughly 30–50mg per cup, about half a coffee. Sencha pairs well with mid-morning and early afternoon. The theanine produces a gentler, more sustained alertness than coffee.
What's the difference between asamushi and fukamushi sencha?
+
Steam time. Asamushi (light-steamed) sencha is steamed for 20–40 seconds, keeping the leaf intact and the cup transparent and clear. Fukamushi (deep-steamed) sencha is steamed for 60–90 seconds, breaking the leaf into finer fragments and producing a deeper, fuller, more strongly-flavoured cup with noticeably less astringency. This run is fukamushi — the deep steam is part of what makes the Yamakai cup so smooth.