Cold Brew Coffee 水出し珈琲

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  • Try this delicious cold brew coffee made with ground coffee, filtered water, and a bit of time and patience, resulting in a less acidic and more aromatic cold coffee.

    Cold Brew Coffee with ice cubes in a glass.

    Mr. JOC and I love good coffee.  In the past, we spent a lot of time trying coffee beans from different boutique roasters and ways to make good coffee at home.

    Since this past summer we have been making almost exclusively Cold Brew Coffee (水出し珈琲) at home and we’re completely in love with it.  Once you try cold-brewing your coffee, you may never go back to your coffee maker!

    Watch How To Make Cold Brew Coffee 水出し珈琲の作り方

    Watch on YouTube

    What is Cold Brew Coffee?

    First of all, it is very different from the traditional “iced coffee”.  Most iced coffee are hot coffee chilled or poured over ice until cold and taste diluted.  Cold Brew Coffee is coffee made with room temperature water, seeping in coffee ground for 8-12 hours.

    It might sound technical and tricky but it’s not at all.  In a tall pitcher, Mason jar, or French press, mix coffee grounds are mixed with filtered water, and then left to sit at room temperature or the refrigerator before the grounds are filtered out.  What’s left is black coffee concentrate.  We like our coffee strong so we drink straight black coffee with ice, or sometimes add just a bit of milk to it.  Depending on the flavors of the bean, we enjoy the coffee in different ways.

    What if you prefer hot coffee?  You can easily heat up your cold brew coffee in a saucepan or in your microwave.  Just don’t let it boiled as it adds acidity and lose flavors.

    A glass of Cold Brew Coffee with milk on a table.

    Why Cold Brew Coffee?

    Why do we drink cold brew coffee?  The cold brew process creates a perfectly balanced, less acidic, more aromatic, really smooth, and delicious cup of coffee.

    The ground coffee slowly infuses into the water.  And this cold-brewing process creates a strong, concentrated brew, leaving behind bitter acids and fatty oils from roasted coffee beans which are soluble only at a high temperature.  Therefore, hot-brewed coffee has that particular acidic taste and effect on your stomach while cold-brewed coffee has less acidic taste.

    And the best part ?  Cold brew coffee is incredibly easy and simple to make, and you can brew it while you’re sleeping!

    A glass of Cold Brew Coffee and ice cubes.

    Coffee Type and Grounds

    Everyone’s preference for coffee is different so try different beans and roasts to find your favorite.  We prefer the dark roast coffee beans because they are more flavorful, but it’s entirely up to you.  For my coffee, I like to grind whole beans right before I make coffee and the grind setting I use is medium coarse.

    As each grinder is different, your medium coarse result could be different from mine, test a few times to see what settings works best for you.  If the coffee is too coarse, water will flow through too quickly and the coffee won’t be as flavorful.  Recently I started to use this new coffee grinder which grinds more consistently than my previous coffee grinder.

    Coffee to Water Ratio

    Many cold brew recipes call for a high coffee-to-water ratio compared to hot brews to make a concentrate.  Here’s a general comparison:

    Hot Brew

    1 oz. (28 g) coffee bean to 8 oz. (237 ml) hot water

    = 2 Tbsp. coffee per 1 cup of water *

    Cold Brew

    2 oz. (57 g) coffee bean to 8 oz. (237 ml) room temperature/cold water

    = 4 Tbsp. coffee per 1 cup of water *

    = 1 cup coffee per 4 cups of water *

    * REMEBER: I don’t recommend using “cup” and “tablespoon” measurements because your coffee-brewing results will vary.  When you measure coffee beans by weight, coffee grounds weigh the same amount as beans.  However, cup/tablespoon measurements of beans and coffee grounds will vary.  For example, 1 tablespoon of beans does not yield 1 tablespoon of grounds.  Always good to have a kitchen scale ($15 on Amazon) in your kitchen. 🙂

    I follow Hario Japanese Water Brew Coffee Pot instruction (coffee to water ratio) and I really love how our our coffee turns out.  I don’t consider my cold brew coffee recipe as a strong concentrate because we can drink it straight without thinning it out.

    If you don’t like the results, experiment with the different coffee grinds and coffee to water ratios.

    A glass of Cold Brew Coffee with ice cubes.

    Equipment I Use for Cold Brew Coffee

    Cold Brew Coffee maker by Hario.

    We have 2 of these Hario cold brew coffee makers at home, so there is an endless supply of cold brew coffee always in our refrigerator.  Please note that you don’t need this Hario Japanese Water Brew Coffee Pot to make my cold brew coffee recipe.  However, I will explain why it’s convenient and worth getting one of these (and I’m not sponsored by this company).

    It’s simple to make cold brew coffee at home, but you will need a large jar/container to infuse coffee, a fine mesh strainer, a cheesecloth, and another large container to catch filtered coffee and to store.

    Or you just get one of these that comes with everything above.

    We tried making cold brew coffee first with Bodum French Press Coffeemaker.  However we have to filter the coffee through filter paper when it’s done brewing as small grounds slips through the fine metal mesh.  The Hario much easier to clean (dishwasher safe), and the reusable filter is much finer than the French Press so no additional filtering is necessary.

    1000 ml (4 cups) is a nice size for daily coffee drinkers!  It’s a bit taller than typical drink bottles, which might be one drawback if your fridge doesn’t have a tall space.

    Giveaway: Keep Your Cold Brew Coffee Cold!

    Zojirushi Stainless Mug Giveaway | Easy Japanese Recipes at

    I’m partnering with Zojirushi today to give away three (3) Stainless Mugs so that you can keep your Cold Brew Coffee cold all day!  Click here to enter for your chance to win!

    Serve Cold Brew Coffee With…

    Banana Bread on a cutting board.

    Banana Bread

    Not A Coffee Fan?

    I hope you enjoy making my Cold Brew Coffee recipe!  If you make this recipe, snap a picture and hashtag it #JustOneCookbook.  I love to see your creations on InstagramFacebook, & Twitter!  Thank you so much for reading and till next time!

    Don’t want to miss a recipe? Sign up for the FREE Just One Cookbook newsletter delivered to your inbox! And stay in touch with me on FacebookGoogle+, Pinterest, and Instagram for all the latest updates.

    4 from 2 votes
    Cold Brew Coffee | Easy Japanese Recipes at
    Cold Brew Coffee
    Prep Time
    5 mins
    Total Time
    12 hrs 5 mins
    Try this delicious cold brew coffee made with ground coffee, filtered water, and a bit of time and patience, resulting in a less acidic and more aromatic cold coffee.
    Course: Drinks
    Cuisine: Japanese
    Keyword: coffee, cold brew
    Servings: 1000 ml (about 4 cups)
    Author: Nami
    • 80 grams whole coffee beans or ground coffee (80 g = 2.8 oz) (See Note)
    • 1150 ml room temperature or cold filtered water (1150 ml = 4 ¾ cup)
    1. Grind the coffee beans on the medium coarse setting on your grinder. You will need 80 grams of ground coffee beans. If you don’t have a coffee grinder, you can usually grind whole beans where you buy the beans or ask the coffee shop to grind for you.
      Cold Brew Coffee | Easy Japanese Recipes at
    2. Based on my experience, the best coffee beans for cold brew are dark roasted and ground to medium coarse. If it’s too fine, the coffee grounds will leak through strainer and light or medium roast are not as flavorful.
      Cold Brew Coffee | Easy Japanese Recipes at
    3. Transfer the ground coffee bean to the mesh strainer and then place the filter in the coffee pot.
      Cold Brew Coffee | Easy Japanese Recipes at
    4. Slowly pour a little bit of water at a time into the filter.
      Cold Brew Coffee | Easy Japanese Recipes at
    5. With a wooden spoon (use gentle corner utensil), blend the water and coffee beans a few times, let the coffee beans soak up water.
      Cold Brew Coffee | Easy Japanese Recipes at
    6. Refrigerate the coffee pot for hours - anywhere from 8 (Hario’s instruction) to 12 (our preference) hours. Anything less could lead to a watered down cold brew and anything more than that could lead to bitter cold brew. You can also try brewing at room temperature vs. using the refrigerator.
      Cold Brew Coffee | Easy Japanese Recipes at
    7. Remove the strainer and discard the coffee beans. If you don’t have a cold brew coffee maker, line a small strainer with cheesecloth and place over a large measuring cup or bowl. Pour the coffee through the strainer.
    8. I recommend you try the cold brew straight first before adding anything to it. Dilute the coffee with as much ice or milk as you prefer. Alternatively you can also warm up the coffee in the microwave or on the stovetop.
    9. Keep cold brew coffee in the refrigerator and enjoy it within 2-3 days before acidity kicks in.
    Recipe Notes

    Coffee Beans: Remember 80 grams (2.8 oz) of whole coffee beans will be still 80 g coffee grounds. If you only use measuring cups, the weight will be different depending on how coarse the coffee ground is and what kind of beans you use.


    For the coffee beans we currently use, 80 grams are roughly 1 1/3 cup of coffee ground. With different coffee beans, 80 g may yield different amount. Some recipes say 1 cup whole coffee beans as ingredient, but keep in mind that willyield different amount of ground coffee.



    Equipment you will need:

    I used this brand in this recipe but now use this brand. It grinds coffee beans more consistently and I love it.

    You can also use a tall pitcher for cold brewing, strainer, cheesecloth, and another tall pitcher for storing your cold brew coffee.


    Recipe by Namiko Chen of Just One Cookbook. All images and content on this site are copyright protected. Please do not use my images without my permission. If you’d like to share this recipe on your site, please re-write the recipe in your own words and link to this post as the original source. Thank you.


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