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Quick Answer: Iced pour-over (flash brew) coffee is made by brewing hot coffee directly over ice using a reduced water ratio. This creates a bright, refreshing iced coffee in 5–10 minutes without the need for overnight steeping.
This iced pour-over coffee recipe (also known as flash brew) is one of the easiest ways to make high-quality iced coffee at home.
Our Go-To Iced Pour Over Coffee Recipe for Warmer Days
As the days grow brighter and the weather warms up, it’s the perfect time to start building your iced drink rotation. For us, a solid flash brew technique is an essential part of any spring and summer coffee lineup.
If you already enjoy pour-over and want a faster, brighter alternative to cold brew, this is worth learning.
What Is Flash Brew?
Flash brew is a pour-over coffee brewed directly over ice. The method uses less brewing water and a slightly finer grind to create a stronger, more concentrated hot coffee. As it drips onto ice, it rapidly chills and dilutes to the perfect strength.
When combined, the brew water and ice equal roughly the same total liquid you’d use for a standard hot pour-over.
If you're looking to refine your grind size further, check out our guide on the best filter coffee grinders for home.
Flash Brew vs Cold Brew
Cold brew takes a completely different approach. Instead of heat, it relies on time—steeping coffee grounds in water for 18–24 hours at room temperature or in the fridge.
It’s a popular choice for batch preparation, often brewed as a concentrate to be diluted with water or milk later.
Flash brew, on the other hand, is all about immediacy and clarity:
- Time: Ready in 5–10 minutes instead of overnight steeping
- Taste: Brighter, cleaner, more expressive flavours
- Convenience: No planning ahead required
The result is a crisp, refreshing cup with pronounced acidity and a lighter body than cold brew.
Neither method is objectively better—it comes down to preference. But if you enjoy crisp, vibrant black coffees, flash brew might quickly become your favourite.
Can You Batch Flash Brew?
Yes, flash brew can be scaled up for larger brewers or batch systems. You can refrigerate it for up to 3 days, making it a viable option for cafés or home prep.
That said, it’s at its best when brewed fresh to order.
The Method
Here’s a simple single-serving recipe. It’s easy to scale with small grind adjustments.
For this brew, we’re using a lightly roasted coffee from Harmony and a 7:3 water-to-ice ratio. You can tweak this depending on your coffee—darker roasts often benefit from slightly less ice.
Recipe
- Coffee: 15g (medium-fine, <20 Comandante clicks)
- Water: 175g at 93°C
- Ice: 75g
- Dripper: Orea 01 (Wave paper)
You can substitute with other brewers like V60, Origami, or Kalita—just expect minor grind adjustments.
Brew Setup
Prepare your pour-over as usual, but place ice in the carafe before brewing.
- Add pre-wetted filter paper to your dripper.
- Add the ground coffee and gently tap to level the bed.
- Place the dripper over your ice-filled carafe.
Pour Structure
- 00:00 – Bloom with 45g in a slow spiral pour
- 00:40 – Add 60g with steady, even coverage
- 01:20 – Finish with a 70g centre pour
Allow the brew to fully drain and the ice to melt before serving.
Serve in a glass over a large clear ice cube. While we are purists at heart, we wouldn't blame you if you wanted to include a slice of orange.
Tips for Better Flash Brew
- Use a lower flow rate than you would for a standard hot pour-over to ensure proper extraction.
- Fruity coffees shine here, but floral and delicate profiles can be just as impressive.
- Try different brewers—zero-bypass drippers and hybrid designs can produce unique results.
- Grind slightly finer, but avoid over-agitation to prevent stalling.
- Let the bed drain between pours; timings may vary depending on your setup.
Common Mistakes
- Brewing too fast → under-extracted, watery cup
- Using too coarse a grind → lack of sweetness and body
- Too much ice → overly diluted final brew
Final Thoughts
Flash brew sits in a sweet spot between precision and immediacy, giving you the clarity of pour-over with the refreshment of an iced drink. Once you dial it in, it’s one of the easiest ways to get consistently great coffee all summer long.
Try it with a few different coffees, adjust your ratios, and make it your own.
FAQs
What is the difference between iced pour-over and cold brew?
Iced pour-over (flash brew) uses hot water brewed over ice for a fast, bright cup, while cold brew is steeped slowly in cold water for 18–24 hours, resulting in a smoother, heavier body.
What coffee beans work best for iced pour-over?
Fruity and light roast coffees tend to work best, as they highlight acidity and clarity. However, medium roasts can also produce balanced and refreshing results.
If you are feeling extra fancy, you can try a Gesha or Sidra, but most high grown coffees work exceptionally well.
For another bright, expressive coffee variety that can work beautifully as iced pour-over, read our guide to Pink Bourbon coffee.
Can you make iced pour-over ahead of time?
Yes, you can batch brew and refrigerate it for up to 3 days, but it’s best enjoyed fresh for maximum clarity and flavour.
Take your brewing game to the next level?
Espresso lovers can find our guide on the Best Coffee Tampers here.
Filter coffee lovers can find our guide on the Best Pourover Filter Coffee Recipes here.
Find some of the best free tools to accompany your brews.
Find your perfect coffee from Harmony's selection of coffee beans here.
Check out our guide on resting coffee to get the most out of your brews.
Find the Best Filter Coffee Grinders For Home here.
Learn about why RDT reduces static in coffee grinding.
Check out our Complete Beginner's Guide to Coffee Processing here.
Learn how to cup coffee like a professional.
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About the Author
Gage is a competition Barista, previously head of coffee for Sale Moon Coffee. He has spent a long time working with Harmony Coffee. He is a Barista trainer and has trained many baristas, and competed in countless coffee championships.
