Introduction:Want to enjoy a refreshing and complex iced coffee in the summer? The AeroPress is not only great for hot brewing but can also produce a high-concentration, clean-tasting coffee through immersion and pressure brewing. This article dives deep into the full process of using the AeroPress for cold brew, covering everything from the tool's mechanism and bean selection, to precise grind size, water temperature, and coffee-to-water ratio settings. We also tested it with washed Yirgacheffe Guji Dingding and Nicaraguan beans, analyzing how ice dilution can be used to achieve an iced coffee that's balanced in acidity and sweetness with a crisp aftertaste.

When enjoying iced coffee in the summer, besides pour over and cold brew, there’s actually another tool that’s simple to use yet capable of extracting delicate flavors — the AeroPress. This coffee tool, which combines immersion, paper filtration, and pressure brewing, can produce clean, rich, and layered coffee liquid, making it especially suitable for pushing the boundaries of iced coffee.

The AeroPress mainly consists of three components: the brew chamber, the filter cap, and the plunger. Its design draws inspiration from the immersion method of a French press, the paper filtration technique of pour over, and the pressure brewing concept of an espresso machine. In practice, you simply mix the coffee grounds and hot water evenly, let it sit briefly, then apply pressure using the plunger to push air through the filter cap, extracting a concentrated and flavorful cup of coffee.

If you prefer a coffee with both acidity and sweetness, consider choosing a honey-processed bean — for example, Costa Rica Mozart is a great option. If you lean towards a more pronounced sweetness, try a naturally processed bean like Natural Huaguang, which features prominent sweet aromas and a long-lasting aftertaste. For those who enjoy a fuller body, Lintong Mandheling and Golden Mandheling both deliver deep, rich flavors. If you’re after bright citrus and berry acidity, washed beans are more suitable, such as Kenya Little Tomato and Yirgacheffe Guji Dingding, both of which showcase outstanding flavor profiles.

The focus of this experiment is how to use the AeroPress to produce a high-concentration coffee liquid suitable for cold drinks, then dilute it with ice cubes to create a refreshing, well-balanced iced coffee in terms of acidity and sweetness. The key lies in adjusting the grind size, water temperature, and coffee-to-water ratio so that the initial extraction is rich and fully extracted, and the final result after ice dilution achieves the desired flavor and mouthfeel.

One of the stars of this test is a washed bean from the Guji Dingding area of Yirgacheffe, known for its fresh floral notes and bright acidity. Here are its detailed specs:

Region: Yirgacheffe Guji Dingding
Elevation: 1800–2200 meters
Variety: Local landrace
Processing Method: Washed
Flavor: Prominent notes of lemon, black tea, and honey, accompanied by white floral and citrus tones. The overall profile is refreshing and layered.

The AeroPress cold brew parameters used in this experiment are as follows:
Coffee Dose: 20 grams
Coffee-to-Water Ratio: 1:9
Grind Size: Espresso grind (close to powdered, very fine)
Water Temperature: 92°C
Total Time: 1 minute 30 seconds

Here are the specific steps:

1. First, remove the filter cap, insert the dedicated paper filter, and rinse the filter with hot water to ensure it fits snugly against the cap. This aids in filtration and preheats the equipment.
2. Turn the AeroPress upside down, add 20 grams of ground coffee into the chamber, then pour in 180 grams of 92°C hot water. Stir gently while pouring and start the timer.
3. After pouring, let it sit for about 50 seconds. You can gently stir with a stirring stick during this time to ensure even saturation of the coffee grounds.
4. Next, place the filter cap on top, and gently press upward to expel excess air inside, preventing it from affecting the subsequent pressing.
5. Flip the AeroPress entirely so that the filter cap and paper are facing downward, with the coffee grounds on top. Then slowly press downward over the course of about 30 seconds, extracting approximately 150 milliliters of high-concentration coffee liquid. The total brewing time is 1 minute and 30 seconds.
6. Pour the extracted high-concentration coffee liquid over 120 grams of hard ice cubes prepared in advance, allowing the ice to naturally cool and dilute the coffee. Adjust the amount of ice based on personal taste preference.
7. Finally, give the cup a gentle shake to evenly distribute the concentration and temperature, and enjoy a refreshing iced coffee with balanced acidity and sweetness.

After dilution with ice, the Yirgacheffe Guji Dingding reveals a bright citrus acidity reminiscent of iced lemon, followed by the soft sweetness akin to black tea. The overall mouthfeel is clean and crisp, making it perfect for hot afternoons and highly recommended for coffee lovers trying AeroPress cold brew for the first time. If you prefer a different flavor profile, you can fine-tune the above parameters to find your ideal extraction combination.

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