How to make flash brewed coffee

Prep - 5 Minutes Cook - 5 Minutes About 3-4 servings
Flash brew , Iced coffee

What is flash brewed coffee?

There's nothing like the taste of cold brew on a hot summer day (or all-year round if you're into that sort of thing). But what do you do when you're craving a cold brew coffee and you need it right then, right now?

The only con of cold brew is how long it takes to make — steeping coffee for 24 hours in cold water isn't for the impatient. Luckily, for those who can't wait, there's an answer: Flash brew. Flash brewing is a method where you intentionally chill coffee as fast as possible in order to create a drink over ice without sacrificing the flavors of the brew. 

Flash brewed coffee — also known as Japanese-style iced coffee — is brewed in a Chemex just like hot coffee. The main difference? The ice, of course. To make flash brewed coffee, you change the water to coffee ratio.How do you change the ratio? Replace 1/3 or 1/2 of the water amount with ice instead. Here's how to brew it.  In this recipe using Death Wish Coffee, we used 40 grams of coffee, 425 grams of water, and 240 grams of ice (about a 16:1 ratio).


  • 1

    Add ice to your Chemex

    Substitute 1/3 or 1/2 of your water ratio with ice. For this recipe, we used 425 grams of water, 240 grams of ice, and 40 grams of coffee.

  • 2

    Heat water to 205 degrees Fahrenheit

  • 3

    Add filter and coarse coffee grounds

  • 4

    Pour your water over the coffee grounds slowly until you reach your ratio

    This coffee has about a 4-minute brew time. Make sure to let your coffee bloom, too, for about 30 seconds. Do this by adding just enough water to saturate your grounds and waiting 30 seconds. Blooming helps release unwanted gasses from the coffee.

  • 5

    Serve over ice and enjoy! 


  • Coarse ground coffee
  • Water
  • Ice


To learn more about how to brew in a Chemex, find our how-to blog here