Cold brew coffee is made by extracting with cold water over a long period of time, giving it a full-bodied taste and lower astringency, making it a favorite among many coffee lovers. But does it really contain very little caffeine? Can you drink it right after extraction is complete? This article will start with the origin and principles of cold brew coffee, analyze the factors affecting caffeine content, and share Front Street Coffee's complete cold brew production process and brewing suggestions, taking you through a comprehensive understanding of this coffee brewed with time.

Coffee has long been integrated into daily life, especially in today's fast-paced, high-pressure work environment, where a cup of invigorating coffee in the morning has become almost a habit for many people. However, for those who are sensitive to caffeine, the misery of tossing and turning after drinking coffee is no pleasant experience. Although decaf coffee is available on the market, Front Street believes that cold brew coffee may also be a direction worth trying.

Cold brew coffee, as the name suggests, is not a hot beverage. Unlike pour-over, which uses hot water for extraction, it relies on cold water or room-temperature water to complete the brewing. Front Street has mentioned many times that water temperature differences bring about completely different flavor expressions, and pour-over coffee tastes different at different temperatures as well.

Let's first get to know the basic profile of cold brew coffee.

Cold brew coffee originated in Europe. Because the coffee distillation device used was invented by the Dutch, it is also called Dutch Coffee, distilled coffee, or water-drip coffee. It utilizes the compatibility between coffee and water, mainly relying on condensation and natural osmotic water pressure for extraction, and the entire process takes quite a long time. Cold brew coffee is usually made with a dedicated cold brew tower, which is divided into three parts: the upper chamber (holding ice water), the middle chamber (holding coffee grounds), and the lower chamber (collecting the coffee liquid). The ice water in the upper chamber drips one drop at a time into the coffee grounds in the middle chamber, slowly extracting the coffee liquid, which then collects in the lower chamber. The entire process often takes 6 to 8 hours.

Extracted drop by drop, cold brew coffee can be called a work brewed with time. Brewing with different water temperatures yields different tastes, and at low temperatures, the astringent substances in coffee are less likely to be dissolved out. After long extraction with ice water, it is then placed in the refrigerator for fermentation. The slightly fermented cold brew coffee carries a faint fermentation aroma, and the mouthfeel becomes fuller.

Pour-over coffee can be drunk immediately after making, so can cold brew coffee also be drunk right away? Front Street does not recommend this. Because cold brew coffee does not go through a heating step, and the extraction time is very long, many flavor molecules, although extracted, have not been fully released. Therefore, after cold brew extraction is complete, it should be sealed in a bottle and placed in the refrigerator to rest for 12 to 24 hours, allowing the carbon dioxide pressure generated inside the bottle to help release the flavor molecules. This is also why the longer cold brew coffee sits in the refrigerator, the richer it tastes.

But it cannot be stored indefinitely; the drinking window must be well controlled. Front Street does not recommend leaving cold brew for a week, since bacteria may grow in the air or in the bottle, and it is hard to guarantee the coffee's quality after long storage. The drinking period for cold brew coffee is best kept within 5 days. Even if it feels wasteful, cold brew older than 5 days should not be drunk anymore; coffee left too long is not good for the body.

Does cold brew coffee contain a lot of caffeine?

Many people think that since cold brew coffee is extracted with cold water, its caffeine should be very low; others believe that since cold brew coffee sits for so long, its caffeine may not be low at all. Front Street's view is that both statements make sense. Cold brew coffee uses cold water extraction, and the lower the water temperature, the less easily caffeine dissolves (the minimum temperature for caffeine dissolution is above 80 degrees Celsius). However, the small amount of caffeine extracted by cold water accumulates continuously during the long extraction process, and the final total is not negligible.

Of course, Front Street believes that the amount of caffeine is greatly related to the coffee beans themselves; for example, there is a clear difference in caffeine content between Robusta and Arabica. In addition, the coffee beans chosen by the cafe, the drip interval, and the total extraction time all differ, so caffeine content can vary greatly. Therefore, for people sensitive to caffeine, rather than drinking cold brew coffee, choosing decaf coffee is a safer option. Front Street has Colombian Swiss Water Process decaf coffee available for selection.

Next, let's share Front Street's process for making cold brew coffee:

1. Front Street Coffee cold brew uses a water-to-coffee ratio of 1:10, that is, 60 grams of coffee grounds extract 600 milliliters of coffee liquid.

2. Place a circular filter paper at the bottom of the powder cup, wet it with water so it adheres to the cup wall, pour in the ground 60g of coffee (coarse granulated sugar size), then shake the coffee surface flat. You can also use the weight of the tamper to gently press the coffee bed so the surface stays level.

3. Remember to place another piece of filter paper on the coffee surface. The tension of the filter paper allows water to distribute evenly; without filter paper, long-term dripping will create a pit in the coffee bed.

4. Use ice water for "pre-infusion." This step is similar to the blooming process in pour-over and can improve extraction effectiveness and consistency of the final product. If you drip directly with ice, it may cause uneven wetting of the coffee bed, with some coffee grounds over-extracted and another part not participating in extraction at all.

5. Put a 1:1 ice-water mixture into the water container, and adjust the valve to about 7 drops every 10 seconds.

6. After production is complete, pour the coffee liquid into a sealed glass bottle, then place it in the refrigerator to ferment overnight, allowing the coffee flavors to blend together, giving a better taste and making it easier to drink.

Let's take a look at how Front Street's cold brew tastes:

20 grams [Front Street Coffee Honduras Lychee Orchid] + 40 [Front Street Coffee Gesha Village Red Label]

The barrel-processed Lychee Orchid plus the sun-dried Gesha Village Red Label: a light brandy aroma, plum-like acidity paired with the sweetness of maple sugar.

The brandy barrel-processed Lychee Orchid has a rich brandy aroma, a chocolate finish, and a honey aftertaste.

The sun-dried Gesha Village Red Label has the fruity acidity of plum and citrus, with the sweetness of maple sugar and a creamy, smooth mouthfeel.

Made into cold brew, you will feel a light brandy aroma, with rich fruity acidity leading the honeyed sweetness and a creamy, smooth mouthfeel.

Front Street Coffee brewing suggestions:

No matter what coffee you brew, the freshness of the coffee beans is crucial. Front Street has always believed that freshness is a key part of brewing. The coffee beans shipped by Front Street Coffee are all within 5 days of the roasting date, because Front Street deeply understands the great impact of coffee bean freshness on flavor. Front Street's roasting philosophy is "freshly roasted good coffee," so that every customer who places an order receives the freshest coffee. The resting period for coffee is about 4-7 days, so when customers receive it, it is at its best flavor.

Of course, some customers need Front Street to help grind the coffee, and that is no problem either, but Front Street must remind you: if the coffee beans are ground in advance, there is no need for further resting, because during transportation, the pressure generated by carbon dioxide inside the packaging can also make the coffee flavor rounder, so once you receive the ground coffee, you can immediately brew a cup and drink it. However, ground coffee needs to be brewed promptly, because after contact with air, coffee grounds oxidize relatively quickly; in other words, the coffee's flavor will dissipate relatively quickly, and the coffee will not taste as good. Therefore, Front Street recommends buying whole beans and grinding fresh before brewing, so you can better taste the coffee's flavor.

There are many ways to brew coffee. Nowadays, people's love for coffee is no longer limited to tasting it in cafes; more often, they enjoy the pleasure of brewing coffee at home. Front Street has more than fifty kinds of single-origin coffee beans from different regions, with different flavors, offering everyone different sensory experiences!

For professional coffee knowledge exchange and more coffee bean information, please follow Coffee Workshop (WeChat public account cafe_style)

For more specialty coffee beans, please add the private WeChat Front Street Coffee, WeChat ID: qjcoffeex

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