Flash-chilled iced tea
Tea brewed hot at double strength directly onto ice, so it chills within seconds. The speed is the whole method: aromatic compounds that volatilise away while a hot brew cools slowly are captured instead, giving a far more fragrant iced tea than gradual chilling produces.
Also called Japanese iced tea, hot brew over ice, flash chill.
How it works
The serving vessel is filled roughly half with ice. Tea is brewed hot using about twice the usual leaf for the final volume, then poured straight over the ice, which melts to make up the difference and drops the temperature almost immediately. The maths matters: brew for the volume of liquid you pour, not the volume of the finished drink.
Why choose it
It is fast — minutes rather than hours — and it preserves aroma that both cold brewing and slow chilling lose. It also avoids the cloudiness that appears when hot tea is refrigerated slowly.
Equipment
- Glass teapot — Borosilicate glass
Tea types it suits
Recorded on the method rather than inferred from the catalogue. A type missing here is not ruled out; it simply has not been written down.
Common problems
- Brewing at normal strength, which the melting ice then dilutes to nothing
- Not enough ice, so the tea cools slowly and goes cloudy
- Using a delicate tea whose aromatics are the point and then adding sugar
Diagnosed problems
Written from the symptom, with the likely causes in order and a question to rule each one out.
- My iced tea has gone cloudy — Tea that was clear when hot turns hazy or milky once chilled.
- My iced tea tastes watery once the ice melts — The tea is good for the first mouthful and thin by the bottom of the glass.
Teas with parameters authored for this method
38 teas have a parameter set written for flash-chilled iced tea, in alphabetical order. Each row is transcribed from that tea’s own record.
| Tea | Leaf (g/100 ml) | Water (°C) | Authored infusions | First infusion (s) |
|---|---|---|---|---|
| Alishan oolong | 2–3 | 90–95 | 1 | 90 |
| Ba Xian | 2.5–4 | 92–100 | 1 | 60 |
| Baozhong | 3–4.5 | 92–98 | 1 | 100 |
| Bi Luo Chun | 2.5–4 | 75–85 | 1 | 120 |
| Ceylon black tea | 2.5–3.5 | 95–100 | 1 | 150 |
| Darjeeling muscatel | 2.5–3.5 | 95–100 | 1 | 150 |
| Darjeeling second flush | 2.5–3.5 | 95–100 | 1 | 150 |
| Dian Hong | 2–3 | 90–95 | 1 | 90 |
| Fukamushicha | 2.5–4 | 75–85 | 1 | 120 |
| Golden Monkey | 2.5–3.5 | 95–100 | 1 | 150 |
| Gui Hua Xiang | 2.5–4 | 92–100 | 1 | 60 |
| High mountain oolong | 3–4.5 | 92–98 | 1 | 100 |
| Huang Zhi Xiang Dan Cong | 2.5–4 | 92–100 | 1 | 60 |
| Jasmine dragon pearl | 2.5–4 | 75–85 | 1 | 120 |
| Jasmine green tea | 2.5–4 | 75–85 | 1 | 120 |
| Jin Xuan | 3–4.5 | 92–98 | 1 | 100 |
| Kagoshima sencha | 2.5–4 | 75–85 | 1 | 120 |
| Keemun | 2.5–3.5 | 95–100 | 1 | 150 |
| Li Shan | 3–4.5 | 92–98 | 1 | 100 |
| Ling Tou Dan Cong | 2.5–4 | 92–100 | 1 | 60 |
| Longjing | 2.5–4 | 75–85 | 1 | 120 |
| Mi Lan Xiang Dan Cong | 3–4.5 | 92–98 | 1 | 100 |
| Mi Xiang black tea | 2.5–4 | 90–96 | 1 | 150 |
| Nilgiri | 2.5–3.5 | 95–100 | 1 | 150 |
| Oriental Beauty | 2–3 | 90–95 | 1 | 90 |
| Phoenix Dan Cong | 2–3 | 90–95 | 1 | 90 |
| Ruby 18 | 2.5–3.5 | 95–100 | 1 | 150 |
| Sencha | 2–3 | 90–95 | 1 | 90 |
| Si Ji Chun | 3–4.5 | 92–98 | 1 | 100 |
| Song Zhong Dan Cong | 2.5–4 | 92–100 | 1 | 60 |
| Sun Moon Lake Assam | 2.5–4 | 90–96 | 1 | 150 |
| Tie Guan Yin | 2–3 | 90–95 | 1 | 90 |
| Uji sencha | 2.5–4 | 75–85 | 1 | 120 |
| Wenshan Baozhong | 2.5–4 | 85–92 | 1 | 120 |
| Xing Ren Xiang Dan Cong | 2.5–4 | 92–100 | 1 | 60 |
| Ya Shi Xiang Dan Cong | 2.5–4 | 92–100 | 1 | 60 |
| You Hua Xiang | 2.5–4 | 92–100 | 1 | 60 |
| Zhi Lan Xiang Dan Cong | 2.5–4 | 92–100 | 1 | 60 |
Sources
This page is TeaHQ synthesis. No external source stands behind the description of this method. It is written from common practice as TeaHQ understands it, and the parameters in the table above come from each tea’s own record rather than from this page.
The numbers for this method are held per tea, never on the method itself. Where a tea has no set written for flash-chilled iced tea, TeaHQ shows nothing rather than converting its numbers from another style — a scaled ratio and a halved time read as an answer while being one nobody authored.
Written comparisons
Where TeaHQ has set this method against something it is routinely confused with, and argued the differences out in full.
- Cold brew vs flash-chilled iced tea — Two ways to arrive at cold tea that extract differently and taste genuinely unlike each other. Neither is a shortcut to the other.