Japanese Iced Coffee / Flash Brew Recipe

Flavor And Tasting Notes

Japanese iced coffee, often called flash brew, produces a remarkably vibrant cup. Brewing hot and immediately cooling over ice locks in delicate aromatics, yielding a crisp and tea-like body with pronounced fruit, floral and citrus notes. Because you brew at full-hot extraction, acidity is lively and the finish is clean and refreshing. Compared to cold brew it’s less syrupy and accentuates a coffee’s origin characteristics.

Preparation And Recipe

1. Prepare ice: Place 165 g of fresh ice into the carafe of your pour-over brewer (Chemex or V60).
2. Dose & grind: Use 30 g of freshly roasted coffee, ground medium-fine.
3. Bloom: Rinse the filter and add the coffee. Start the timer and pour 60 g of 94 °C water to saturate, stirring gently. Allow to bloom for 30 seconds.
4. Brew: Pour the remaining 315 g of hot water slowly in concentric circles over 2½ minutes, maintaining a steady flow.
5. Cool & serve: Swirl the carafe to melt the ice and chill the brew. Serve over a glass filled with fresh ice. Yield is about 500 ml. Enjoy black or with a splash of milk or syrup.

Dialing In And Troubleshooting

• Maintain a total water weight (hot water + ice) equivalent to your target brew ratio (e.g., 30 g coffee : 500 g water/ice).
• If the drink tastes weak, grind slightly finer or reduce the ice quantity. If it’s too strong or sour, increase the ice or pour faster.
• Use high-quality single-origin beans to showcase nuanced flavors; washed Ethiopian or Kenyan coffees shine with this method.

History And Culture

Flash brewing gained popularity in Japan in the 1960s when specialty coffee shops sought a way to serve iced coffee without losing delicate aromas. The method pours hot water over ice to rapidly cool the brew, preserving acidity and clarity. It spread globally as the third-wave coffee movement embraced pour-over techniques. Modern baristas appreciate flash brew for its ability to highlight origin characteristics while delivering a refreshing iced beverage.

Editor's Take

Practical Detail

Common Questions

Sources And Further Reading