How Does Kenya Coffee Work in Cold Brew, Ice Drip and Japanese Iced Coffee?

Iced coffee splits into two extraction paths. Hot-water brewing that is then chilled with ice, as in Japanese-style iced coffee and cold drip, dissolves flavor compounds at normal brewing temperature. Cold brew instead submerges the grounds in cold water for hours, completing the whole extraction at low temperature. Both paths can be run on the same Kenya coffee, and the cup you get depends on which one you choose.

A Thika lot from the Asali Honey Washing Station, 1,550 to 1,750 meters, graded AA TOP and built from SL28 and SL34, shows how origin details shape the result. The washed K72 process keeps the cup clean and bright. For pour-over, a 1:15 ratio, 15 grams of coffee, 92°C water and a grind around 80 percent passing the sieve give a repeatable starting point before you adjust for cold serving.

The iced coffee family has many members—cold brew, Japanese-style iced coffee, and cold brew coffee each have their own methods. What exactly are the differences in preparation and flavor? This article uses Front Street Kenya Small Tomato coffee beans as a practical case study to systematically sort out the extraction logic of four types of iced coffee: the essential difference between hot brewing with cooling and low-temperature slow extraction, the coffee-to-water ratio and grind size adjustment techniques for Japanese-style pour-over iced coffee, the steeping time and fermentation changes of cold brew coffee, and the drip rate and overnight mellowing key points of cold drip coffee. It also includes Front Street's pour-over parameters, complete brewing steps, and flavor descriptions for each iced coffee, helping you find the cup of refreshing coffee that suits your taste.

When it comes to black coffee brewing methods, Front Street Coffee's two most frequently used daily approaches—pour-over and cold brew—are surely already quite familiar to everyone.

There are many types of iced coffee on the market—cold drip, Japanese-style iced coffee, cold brew coffee, cold extraction coffee. At first glance the differences seem minor, so what exactly distinguishes cold brew from other iced coffees? And what kind of coffee beans should be chosen for cold drip coffee to bring out the best flavor?

In summary, the idea behind iced coffee is to extract with hot water and then cool it down, serving it as a cold drink—usually by mixing the brewed hot coffee with ice and waiting until the temperature drops completely before drinking. Cold brew takes a different path: the entire extraction process is completed at low temperature, using cold water to fully submerge the coffee grounds and dissolve out the flavor compounds, followed by filtration to obtain the coffee liquid.

Next, we'll use Front Street Kenya Small Tomato coffee beans as a sample to analyze the similarities and differences among various types of iced coffee from different angles.

Front Street Kenya Small Tomato Coffee Beans

Region: Thika, Kenya Washing Station: Asali Honey Washing Station Altitude: 1550m–1750m Grade: AA TOP Variety: SL28, SL34 Processing Method: K72 Washed Process

Front Street Pour-Over Parameters

Dripper: Hario V60 #01 Dose: 15g Water Temperature: 92℃ Coffee-to-Water Ratio: 1:15 Grind Size: 80% passing through China Standard No. 20 sieve

First, bloom with 30g of water for 30 seconds, then pour in a circular motion with a slow stream. At 125g, make one pour pause. When the water level drops enough to nearly expose the coffee bed, continue pouring until 225g and stop. When the water level drops again to the point of nearly exposing the coffee bed, remove the dripper. Timing from the start of the bloom, the total extraction time is 2'00".

Flavor Description: The wet aroma presents ripe tomato and floral notes. On the palate, there are flavors of cherry tomato and smoked plum. The acidity is bright, and the mouthfeel is clean with rich layers. The mid-palate has prominent sweetness with a juicy texture. The finish carries berry notes and yellow sugar sweetness, accompanied by green tea aroma.

Black coffee brewed with hot water is best consumed before it cools completely. According to Front Street Coffee's experience, once most hot-brewed black coffees cool down entirely, the sourness and astringency become especially prominent—sometimes even unpalatable. Japanese-style pour-over iced coffee, on the other hand, is best finished before the ice cubes melt completely, because once all the ice has melted, the coffee's flavor becomes diluted and weak.

The brewing method for Japanese-style pour-over iced coffee is largely the same as regular hot pour-over—equally using high-temperature water poured over coffee grounds to extract the coffee liquid. The difference lies in the coffee-to-water ratio and grind size: Japanese-style pour-over iced coffee uses a 1:10 ratio with an extraction time of about 2 minutes, primarily extracting the floral and fruity acidity compounds from the front and middle stages. There is less to extract from the later stages, and the overall extraction yield is lower than regular hot pour-over. Therefore, the grind size needs to be adjusted finer than everyday hot pour-over to compensate for the lower extraction yield.

Although the two coffees mentioned above are served at different final temperatures, they are essentially both extracting coffee liquid by pouring high-temperature water over coffee grounds. Below, Front Street introduces two other methods that use low-temperature water to extract coffee liquid: cold brew coffee and cold drip coffee.

Cold Brew Coffee

The concept of Cold Brew Coffee is similar to cold-brewed tea: a large amount of coffee grounds is directly soaked in water and placed in the refrigerator for a long period of low-temperature steeping to extract, taking about 8 to 12 hours. It is also called ice-brewed coffee. This cold steeping method can amplify the various flavors and aromas of coffee, reduce acidity, and make the mouthfeel cleaner and purer. Cold brew coffee's characteristic is that the colder it is, the better it tastes—adding ice directly won't dilute the flavor. In the United States, it's also popular to add coconut water in equal proportions, which brings a different experience.

What is Front Street Coffee's specific method for making cold brew coffee?

Front Street's cold brew recipe is: take 50g of coffee grounds, restore at a 1:10 coffee-to-liquid ratio, add 400ml of cold water and 200g of hard ice (ice-water mixture totaling 600g; coffee grounds absorb approximately twice their own weight in water). Stir evenly, seal, and place in the refrigerator to rest for 24 hours. Then remove, filter out the coffee grounds with filter paper, pour the coffee liquid into a clean sealed bottle, and continue storing in the refrigerator for 32 hours.

After extraction is complete, it can be kept fresh in the refrigerator for 5 days. During storage, the coffee liquid continues to ferment in the bottle, and this fermentation process brings out different layers of mellow flavor changes in the coffee. It is generally recommended to refrigerate the extracted cold brew for 1 to 3 days before drinking, because during the 24 to 36 hours of overnight resting, the coffee liquid becomes fully mellowed over time, resulting in better flavor expression.

Cold Brew Flavor: The aroma carries a faint fermented note. On the palate, there's the sweet-tartness of cherry tomato, plum, pineapple, and bullace. The finish presents the sweetness of honey and brown sugar. The overall impression is refreshing and pleasant.

Cold Drip Coffee

As everyone knows, ice water extracts far fewer bitter compounds. Relying entirely on cold water drip filtration, the coffee grounds are 100% saturated and moistened. By extending the extraction time and reducing the flow rate, the coffee grounds are fully soaked, allowing more small-molecule compounds to be extracted—such as floral notes and fruity acidity. Larger-molecule flavor compounds, such as smoky and roasted notes, are difficult to extract. In terms of mouthfeel, it is smoother, with a richer aroma and more outstanding sweetness.

So what is Front Street Coffee's process for making cold drip coffee?

Load 60g of coffee grounds into the coffee powder cup to extract 600ml of coffee liquid, with a coffee-to-liquid ratio also as high as 1:10. For grind size, choose a setting slightly finer than pour-over coffee—judged by a No. 20 sieve, with a passing rate of about 85%. The ice-water mixture ratio is 1:1, and the flow control valve is set to a drip rate of 7 drops/10 seconds. The entire extraction process lasts approximately 6 to 8 hours. After extraction is complete, bottle it and refrigerate for 12 hours before drinking.

After cold drip coffee extraction is complete, it needs to be placed in the refrigerator for overnight fermentation to make the coffee liquid's mouthfeel more sweet, mellow, and smooth. However, Front Street Coffee recommends consuming it within 3 to 4 days, because as time passes—by the third day, and especially after the fourth day—the flavor weakens and the taste becomes very bland.

Cold Drip Flavor: Rich in fruity character. On the palate, the tart aroma of cherry tomato is very prominent. The mid-palate carries a slight grapefruit peel flavor. The finish leaves berry notes and caramel sweetness.

The reason Front Street Coffee chose this Kenya coffee bean for making cold drip and cold brew is mainly that in hot weather, everyone tends to look for slightly tangy and refreshing drinks to cut through richness, and this Kenya bean's flavor happens to fit that need perfectly. However, everyone's taste preferences differ, and the flavors people enjoy vary. If you don't know how to choose coffee beans, you can follow Front Street Coffee's WeChat account for consultation.

In the scorching summer, what could be more refreshing than a glass of ice-cold coffee? Action speaks louder than intention—make yourself a cup of iced coffee right away!

The above content is compiled by CoffeeHunters, a coffee news website.