Answer firstFlash brew is a normal hot pour-over brewed straight onto ice. Hot extraction captures the aromatics, and the ice locks them in instantly, giving a bright, clean, aromatic cup. Total water is 1:15, of which about 40% is ice and 60% is hot water. It is nothing like cold brew (12–24 hours), and perfect for Malaysia’s heat.
Flash brew = hot extraction, straight onto ice
Why it tastes so good
Hot water captures aroma compounds (cold brew cannot); pouring onto ice chills it instantly and locks those aromatics in. That is why flash brew is brighter and more aromatic than cold brew.
Hot extraction captures aroma → instant chill → aroma locked
The recipe (three numbers)
20g
Coffee
180g
Hot water (~60%)
120g
Ice (~40%)
1:15
Total (water + ice)
Ice counts as water: 120g ice + 180g hot water = 1:15
Flash brew vs cold brew
Flash brew: bright and fast; cold brew: smooth and slow
Flash brew
Cold brew
Time
~3 minutes
12–24 hours
Flavour
bright, fruity, clean
smooth, low-acid, mellow
Aroma
strong
weaker
Grind and steps
Grind medium-fine (a touch finer than a hot pour-over, since total water is lower). Steps: 1. Put 120g ice in the server. 2. Have 180g hot water ready (90–94°C). 3. Brew a normal pour-over so the coffee drips straight onto the ice. 4. Swirl and serve.
Grind: medium-fine
Ice in server → hot water → brew onto ice → swirl
Want more iced drinks and pour-over variations? JWC’s 1-day hands-on class covers them.
FAQ
How much ice?
About 40% of the total water (e.g. 120g ice + 180g hot water).
How is it different from cold brew?
Flash brew is fast, bright and aromatic; cold brew is slow, smooth and low-acid.
How fine should I grind?
Medium-fine, a touch finer than a hot pour-over.
Won’t it be watery?
The ice is counted in the total water, so with the right ratio it won’t be weak.
Bright, iced, 3 minutes
Malaysia is hot. Want a bright iced coffee?
Learn pour-over and iced variations in one afternoon · RM199 · real gear · hands-on
