How is coffee a refreshment when served as cold drip?

Cold drip coffee is made by letting ice water pass through coffee grounds drop by drop at a constant speed. Because the water stays cold, bitter compounds are extracted slowly and the resulting liquid is mellow without harshness. The low temperature and slow flow together raise extraction efficiency, so is coffee a refreshment in summer becomes a fair question: the drink is cooling, sweet-sour and easy to finish.

A cold drip pot has upper, middle and lower sections and four core parts: the upper pot, the valve, the filter and the lower server. Costa Rica Mozart beans are used as the example, with grind size, coffee-to-water ratio and flow rate as the key parameters. Four bean styles are suggested, covering tropical fruit fermented wine notes, a clean and refreshing profile, sweetness and blended flavor.

Cold drip coffee, with its unique low-temperature slow extraction method, presents a rich yet not bitter taste, making it an excellent choice for summer refreshment. This article will start from the basic principles of cold drip coffee, introduce the structure and usage of the cold drip pot in detail, and take Costa Rica Mozart coffee as an example to share key extraction parameters such as grind size, coffee-to-water ratio, and flow rate. At the same time, based on different flavor preferences, it recommends four types of coffee beans: tropical fruit fermented wine aroma, refreshing and clean, sweet and delicious, and flavor blends, helping coffee enthusiasts make an ideal cup of cold drip coffee at home.

So-called cold drip coffee is made by letting ice water pass through the coffee grounds drop by drop at a constant speed, slowly dissolving the aromatic components from the coffee under normal pressure over a longer period of time. Because the water temperature is extremely low, bitter substances are not easily extracted, while the slow water flow improves extraction efficiency, so the resulting coffee liquid is mellow but not bitter. If you choose beans with strong flavor expression to make it, the fermented notes interweave with the fruity sweetness and acidity, and combined with the cooling sensation of ice, one sip on a hot summer day instantly feels refreshing.

Having understood the above background, Front Street believes you already have a general idea that this method of using cold water to soak coffee grounds to obtain coffee liquid is what people often call Dutch Coffee. Cold drip coffee, which evolved from the cold brew approach, is also classified as Dutch Coffee. In addition, there is a newer form of low-temperature extraction—Cold brew coffee—which involves pouring ice water into a container filled with coffee grounds, letting it sit for 12 to 24 hours, and then filtering out the grounds to obtain a cup of iced coffee with a slight wine aroma and sweet-and-sour taste. Its principle is exactly the same as Dutch Coffee, so it is also considered a member of the Dutch Coffee family.

How to use a cold drip coffee pot

The cold drip pots available on the market vary widely in device, material, and shape, but they usually consist of three parts: upper, middle, and lower, which can be further divided into four core structures: the upper pot, the valve, the powder cup, and the lower pot.

The top container is used to hold ice cubes and water. Below it is connected a metal component, namely the valve. By adjusting the water outlet diameter, you can change the speed at which water droplets fall, allowing ice water to drip evenly into the coffee grounds. The middle glass pot, shaped like a cup, is used to hold the ground coffee. There is a filter hole in the center of the bottom, through which the extracted coffee liquid drips out, while the large pot at the bottom is responsible for collecting this coffee liquid.

This time Front Street selected a Costa Rica Mozart coffee that is quite popular in stores for demonstration. Mozart coffee beans use raisin anaerobic honey processing, with flavor notes of raisins, osmanthus, and fruity fermented sweetness. After being made into cold drip, the fermented sensation becomes more prominent.

In terms of grinding, Front Street usually uses the same coarseness as for ice hand brew. Because low-temperature water reduces the extraction rate, the coffee is ground slightly finer to compensate. For this bean, based on an 85% passing rate with the Chinese No. 20 standard sieve, the corresponding grind size at Front Street stores is 9 on the ek-43s grinder.

Generally, we first determine the extraction parameters: coffee-to-water ratio 1:10, that is, 60 grams of coffee grounds to extract 600 grams of coffee liquid; ice-water mixture prepared at a 1:1 ratio; valve flow rate controlled at 7 drops per 10 seconds, with the whole process completed in about 6 to 8 hours. (Usually the coffee-to-water ratio for cold drip is between 1:10 and 1:12; you can adjust flexibly according to your taste preference.)

Place a round filter paper at the bottom of the middle pot and wet it with water so it adheres, then pour in the ground coffee. Be careful to level it so that extraction is even. Also cover the surface of the coffee bed with a round filter paper to prevent water droplets from disturbing the coffee bed. Before starting the drip, the coffee bed needs to be pre-wetted with cold water. This shortens the extraction time and also avoids uneven extraction at the beginning.

Set the powder cup on the stand and begin pouring in the ice-water mixture, usually half ice and half water. Adjust the valve flow rate to 7 drops/10 seconds, and keep the position where the water droplets fall aligned with the position where the coffee liquid is filtered out. After the dripping is finished, pour the coffee liquid from the lower pot into a sealable container—Front Street uses a glass bottle—and refrigerate it for fermentation for more than 12 hours. Generally, it can be drunk the next day.

After a night of refrigeration, Mozart coffee will show a wine-like fermented quality, as well as the sweet-and-sour notes of tropical fruits such as berries and pineapple. The taste is rich but not bitter, and after dilution with ice it feels like drinking a refreshing fruit wine.

How to choose coffee beans for cold drip coffee

The most notable feature of cold drip coffee is long extraction at low temperature, so when selecting coffee beans, priority is generally given to types with distinct flavor characteristics. Below, Front Street introduces several representative flavor directions.

1. Front Street tropical fruit and fermented wine aroma type

Front Street Mozart coffee is recommended, with the sweet-and-sour notes of dark berries, plus the wine aroma produced by low-temperature aging, taking the overall taste to an even higher level. In addition, there are several other beans on the Front Street bean list that also belong to this type, such as Colombia's Front Street Sidra coffee, Front Street Ombligon, Front Street Strawberry Candy coffee, and Costa Rica's Blackberry coffee. Their aromas are all very distinct, and they are likewise suitable for ice hand brew or cold brew.

2. Front Street refreshing and clean type

Some beans, after washed processing, have clean and full acidity. When made into cold drip coffee, they present juice-like acidity and the clear fragrance of cherry tomatoes and pomelo, making them especially suitable for drinking in the heat of summer. The most representative ones are Kenya's Front Street Little Tomato coffee, Ethiopia's Front Street Gutingding, and Panama's Front Street Butterfly. If you prefer a fresh style, this pure and transparent taste will surely satisfy you.

3. Front Street sweet and delicious type

Compared with the medium-light roasted coffees in the above two categories, dark roasted beans are generally rarely used for cold drip, and many people think it will be strong and bitter. Actually, this is not necessarily the case. Front Street once tried using Indonesia's Front Street Golden Mandheling to make cold drip coffee. After adding ice, it had a rich chocolate sweetness and also a hint of fermented aroma, not bitter or astringent at all. If you cannot accept the "heavy taste" of Mandheling, Brazil's Front Street Queen's Farm can also present a nutty and chocolate flavor direction, with a smooth creamy mouthfeel after dilution with ice.

4. Front Street flavor blend type

Friends who often drink espresso must know that coffee beans can be blended to combine flavors, and cold drip coffee can do the same. In addition to using single-origin beans with clear flavors, cold drip can also extract a mixture of two or more single-origin beans. For example, Front Street Sidra + Front Street Kenya, Front Street Mozart + Front Street Red Cherry, and Front Street Ombligon + Front Street Butterfly can all show very good complex flavors.

Regarding flavor expression, everyone can refer to the categorized recommendations given by Front Street above when choosing. Because cold drip coffee is extracted at low temperature, the efficiency is slower, so its inclusiveness is also relatively high. You can adjust flexibly according to factors such as your own equipment and budget. It should be noted here that all flavor expression is based on the roasting freshness of the coffee beans, so Front Street recommends choosing coffee beans within their optimal flavor period. Front Street's roasting principle is fresh roasting of good coffee, and everything Front Street sends out is coffee beans freshly roasted within 5 days, hoping every customer can drink good coffee during its best flavor period.

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