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Part of Are three clocks really running at once during tea brewing methods
How to run a four method tea brewing flight on one tea, start to finish
A four method flight design for one tea: what studies predict for hot, cold and iced steeping, plus scoring and why herbal infusions need their own flight.
What to take away
- One tea, several methods, everything else held constant. That is the entire design.
- Hot and cold steeping do not produce strong and weak versions of one drink. They produce different compositions.
- A brief hot steep finished with ice reached results close to cold steeping in a fraction of the time in one study.
- Herbal infusions behave differently again, so keep them in a separate flight rather than mixing them in.
The design
Buy enough of one tea to run four methods on the same day. Same leaf, same water, same weight per volume, same vessel where possible. Then change only the method.
Four brewing methods compared
Hot standard
- Dose
- 3 g
- Water
- 200 mL
- Temp
- 90 C
- Time
- 3 min
Cold steep
- Dose
- 3 g
- Water
- 200 mL
- Temp
- Fridge
- Time
- 8-12 h
Hot then iced
- Dose
- 3 g
- Water
- 100 mL
- Temp
- 90 C
- Time
- 3 min
Short and repeated
- Dose
- 5 g
- Water
- 100 mL
- Temp
- 90 C
- Time
- 20-30 s
Setup
- Hot standard
- 3 g / 200 mL at 90 C
- Cold steep
- 3 g / 200 mL, refrigerated
- Hot then iced
- 3 g / 100 mL at 90 C, poured onto 100 mL ice
- Short and repeated
- 5 g / 100 mL at 90 C
Time
- Hot standard
- 3 min
- Cold steep
- 8 to 12 h
- Hot then iced
- 3 min
- Short and repeated
- 20 s, then 25, then 30
Prepare the cold steep the night before so all four are ready together. Tasting them a day apart defeats the point.
What the research says you should expect
A study compared hot steeping, cold steeping, and a brief hot infusion followed by ice across green, black, and oolong tea. It reported that hot infusion extracted rapidly but with relevant compound degradation, while cold infusion extracted more with slower kinetics.
Iced method doubles key compounds
2x gallic acid and EGCG vs hot infusion
Brief hot infusion then ice reached cold-infusion-like properties quickly
Hot infusion extracted rapidly but degraded relevant compounds
The brief-hot-then-ice method reached properties similar to cold infusion in a short time. For green and black teas, gallic acid and EGCG values were about double those of hot infusion.
That gives your flight a prediction to test. If the iced sample tastes closer to the cold steep than to the hot one, the chemistry and your palate agree. If it does not, ask why, and the answer is usually the dose or the ice ratio.
Keep herbal infusions in their own flight
Rooibos, chamomile and the rest are not tea and do not respond the same way. A box mixing them with tea needs at least two water temperatures, which is a setup question rather than a tasting one.
A study of red and green rooibos compared cold brewing, regular brewing and microwave boiling. It found that boiling delivered the highest total polyphenol content and antioxidant capacity of the methods tested. Cold and regular brewing of green rooibos gave similar results to boiled red rooibos.
Boiling hard is the wrong instinct for most true tea and a reasonable one for several herbal infusions. Mixing the two categories into one flight teaches you nothing about either.
Running it
- Taste the hot standard first while it is still hot.
- Taste the cold and iced samples at the same temperature as each other.
- Score bitterness, astringency, body and aroma strength separately.
- Note which one you would make again tomorrow.
- Repeat the whole flight with a second tea of a different type.
The second tea matters. Methods do not rank the same across categories, and a flight run on one green tea tells you about that tea, not about cold brewing. Holding one axis and letting nothing else move is the general rule for a flight, whatever the axis happens to be.
Tasting flight checklist
- Taste hot standard first while hot
- Taste cold and iced at same temperature
- Score bitterness, astringency, body, aroma separately
- Note which you would make again tomorrow
- Repeat with a second tea type
What this changes about the rest of your week
You will likely find one method you dismissed. Usually it is the hot-then-iced format, which makes a cold drink in three minutes.
Where that fits alongside other serving formats is in five ways to serve specialty tea without overdoing it. The underlying reason methods differ is in what happens during a typical tea brewing methods project.
Common questions
How much tea does this take?
About 14 g for the four methods above. Buy 25 g and you can run the flight twice.
Can I compare methods across different teas?
No. That changes two variables at once and the result will not mean anything.
Should the cold steep be refrigerated?
Yes. Room temperature steeping for eight hours is a food safety question you do not need to have.
Which method wins most often?
There is no general answer, which is the reason to run the flight. Lightly oxidized teas tend to do well cold; roasted and fully oxidized teas tend to do well hot.
