Cold brew coffee, by virtue of its low-temperature slow-drip extraction method, demonstrates unique advantages in both taste and preservation. It not only avoids the bitterness brought about by high temperatures, but also achieves a rich, layered, aromatic flavor through prolonged refrigerated fermentation. However, making a pot of cold brew takes 6 to 8 hours, and the amount of grounds used is also higher than for regular cold coffee, so the price is relatively higher. Why exactly is cold brew coffee so sweet and smooth? How long can it be stored? And what beans should be chosen to make it? This article will start from Front Street Coffee's production experience to answer these questions one by one, and recommend the dark-roasted Golden Mandheling, which is suitable for making a rich cold brew.

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In coffee enthusiast circles, cold brew coffee has always been a very popular product at Front Street Coffee. Especially in the hot summer, Front Street's baristas make cold brew almost every day, ensuring the refrigerator is stocked with cold brew coffee of various flavors.

What is cold brew coffee? Literally speaking, cold brew coffee is a method of completing extraction with the help of "low temperature" and "slow drip filtration." Temperature directly affects the decomposition speed of oils, acidic substances, and sugars in coffee. Because these components are released at different rates, the aroma, taste, and mouthfeel of the final product also show obvious differences. This is precisely the fundamental reason why different extraction methods can produce coffees of different qualities.

Characteristics of cold brew coffee More prominent sweetness: The aroma molecules in coffee dissolve in a certain order; those pleasant aromatic substances are extracted first, followed by the components that bring bitterness.

If coffee is brewed with hot water, a slight lack of attention to controlling temperature and time can easily dissolve too many bitter substances as well, causing an imbalance in taste. Cold brew coffee, however, relies on long extraction with cold water, releasing only the good aroma molecules, so it tastes richer and smoother, presenting coffee's most authentic flavor. Not bitter, not sour, not astringent—this is precisely the key reason cold brew coffee has won a large following.

Long shelf life: Once food is heated and its molecular structure is destroyed, it easily spoils. Coffee brewed with hot water has an extremely short shelf life; after sitting for more than 45 minutes, the flavor begins to decline. Cold brew coffee has no heating step throughout the process, so its shelf life is much longer. After extraction is completed, it can be stored in the refrigerator for about two weeks, and the fermentation process during this period will also allow the coffee's flavor to develop different layers of rich mellow sweetness.

Generally speaking, a pot of about 600ml of cold brew coffee requires a production process of 6–8 hours, and throughout the entire process one must pay attention to whether the water droplets are falling at a uniform rate. In addition, compared with cold coffee such as iced pour-over and iced Americano, cold brew consumes more coffee grounds, so its pricing is also somewhat higher. For example, a cup of cold brew coffee at Front Street sells for 40 RMB.

Usually, the extracted cold brew coffee is placed in the refrigerator 12-24 hours before drinking, and the flavor expression will be better. Many people also say that after being stored for a week, cold brew becomes very mellow and smooth, but Front Street does not recommend storing cold brew for a week. After all, it is hard to avoid bacteria in the air or in the bottle, and it is difficult to guarantee the coffee's condition if it is left for too long. The best drinking period for cold brew is best kept within 72 hours .

Precisely because cold brew has so many of the above advantages, some friends left us messages asking: if one prefers coffee with a rich, sweet, and mellow taste, which kind of coffee beans should be chosen to make cold brew?

According to Front Street's production experience, if you like mellow, bitter, and rich black coffee, it is recommended to use dark-roasted Front Street Golden Mandheling to make cold brew. This bean uses the region's unique wet-hulled process, and when brewed it often displays aromas of caramel, spices, herbs, and nuts. When made into cold brew, it further demonstrates a solid mellow body and fullness, as if eating a piece of unsweetened dark chocolate.

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