How to Brew Japanese Tea: Temperature, Time, and Ratio

If you have tried Japanese green tea and found it bitter, thin, or vaguely like hot grass, there is a good chance nothing was wrong with the tea.

Japanese green tea is unusually sensitive to water temperature — far more so than black tea, which is what most people's brewing instincts are built on. Pour boiling water on sencha and you will extract catechins (bitterness) before theanine (sweetness) has a chance to dissolve. The result tastes harsh no matter how good the leaves were.

Three numbers fix almost everything.

The three numbers

Tea	Water temp	Time	Leaf per 100ml
Gyokuro	50–60°C	2 min	3–4 g
Sencha	70–80°C	60 sec	2 g
Kukicha	70–80°C	60 sec	2 g
Bancha	80–90°C	30–45 sec	2 g
Genmaicha	80–90°C	30 sec	2 g
Hojicha	95–100°C	30 sec	2 g

Two patterns explain the whole table:

1. The sweeter and more expensive the tea, the cooler the water. Shaded teas hold their sweetness at low temperatures and lose it at high ones.
2. Roasted teas want boiling water. Roasting has already removed what heat would damage.

How to hit the temperature without a thermometer

You do not need equipment. Water loses roughly 10°C every time you pour it into a room-temperature vessel.

• Boiling → pour into an empty cup → about 90°C
• → pour into a second cup → about 80°C
• → into the teapot → about 70°C

For gyokuro, this is exactly why traditional sets include a yuzamashi (a wide, shallow cooling vessel). Two transfers takes you from boiling to roughly the right zone.

A rougher shortcut: boiled water left uncovered in a mug drops to about 80°C in two minutes and about 70°C in four.

For what it is worth, here is my actual kitchen routine: I do it by feel. The kettle clicks off, I wait a moment, I pour — no thermometer involved. Tea is like coffee in this respect. If you want the very best cup the leaves can give, temperature deserves real attention; if measuring every time would stop you from making tea at all, settling into your own approximate routine is the better trade, and the more relaxed one. The transfer trick above is how that feel gets built in the first place — do it deliberately for a week, then trust your hands.

The ratio people get wrong

Most Western brewing instructions say "one teaspoon per cup." Japanese green tea leaves vary enormously in density — a teaspoon of fluffy sencha and a teaspoon of dense gyokuro differ by a factor of two — so weight is more reliable than volume.

The working number is 2 grams per 100ml for most teas, and 3–4 grams per 100ml for gyokuro, which is brewed strong and served in small amounts.

If you are not weighing: for a standard 200ml cup, use a heaped tablespoon of sencha. Erring slightly heavy and brewing short is better than erring light and brewing long — under-leafed tea brewed longer goes bitter without gaining body.

Time, and why 60 seconds is not a suggestion

Japanese green tea is not a teabag. The leaves are processed by steaming, which breaks down cell walls and makes them release compounds far faster than the pan-fired Chinese teas most people are used to.

Sencha at 60 seconds is bright and balanced. The same leaves at three minutes are astringent and flat. There is no upside to leaving it longer — you are not extracting more flavour, you are extracting a different, worse flavour.

Always decant completely. Pour every last drop out of the pot. Liquid left sitting on the leaves keeps extracting, and the second brew will be ruined before it starts.

The second and third infusions

This is the part most people outside Japan skip, and it is where a lot of the value is.

Japanese green tea is designed to be brewed multiple times:

• First infusion: as the table above. Aromatic, balanced.
• Second infusion: water slightly hotter (about 10°C more), time much shorter — 10 to 20 seconds. Often the most full-bodied of the three.
• Third infusion: hotter again, 30–40 seconds. Lighter, thinner, still pleasant.

With gyokuro in particular, many people consider the second infusion the best one. Buying good tea and drinking it once is throwing away most of what you paid for.

This is honestly my favourite part of drinking Japanese tea: the same leaves keep handing you a slightly different cup, and tasting the flavour move from one infusion to the next is a genuine pleasure — one that a teabag dunked once and thrown away never offers.

Do you need a kyusu?

A kyusu — the Japanese side-handled teapot with a built-in mesh filter — is genuinely useful, for one reason: it lets you pour out every drop quickly, which matters because of the decanting rule above.

But you can start without one. A small teapot with a wide basket filter works. What does not work well is a narrow infuser ball: the leaves need room to expand, and cramped leaves brew unevenly.

If you do buy a kyusu, get one sized for how you actually drink. A 300ml pot used to make 150ml of tea will always be awkward.

Five mistakes, in order of how much damage they do

1. Boiling water on sencha or gyokuro. Biggest single cause of "I don't like green tea."
2. Brewing too long. Three minutes is not more flavour, it is worse flavour.
3. Leaving water on the leaves between infusions. Ruins the next cup.
4. Cramped infuser balls. Leaves need to open.
5. Old tea. Green tea does not improve with age. Buy small, keep it cold, finish it.

The one-minute version

Cool the water. Use more leaf than feels right. Brew for less time than feels right. Pour out every drop. Brew it again.

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Not sure which tea you have, or which one to buy? Start with our guide to Japanese green tea types, or read about what matcha grade labels actually mean.