cold brew coffeeIt is one of the essential drinks that we can enjoy on hot summer days. Standing in front of the blackboard at FrontStreet Coffee, looking at the dazzling array of coffee categories, all knowledge of the production areas was immediately forgotten, and I didn’t know where to start. This time, let Front Street introduce it to you.cold brew coffeerelated.
What is cold brew coffee?
Cold brew coffee is brewed completely differently than regular hot coffee. Just to understand it literally, cold brew coffee means using lower temperature water to extract coffee. However, it may be because iced Pour over(V60) coffee or iced Americano is produced with ice + coffee. Front Street has encountered many friends who mistakenly regard iced Pour over(V60) coffee as cold brew coffee.
If you want to clearly identify what cold brew coffee is, in fact, you only need to look at the water temperature used in the extraction process. Cold brew coffee generally uses low-temperature water at room temperature or even close to 0 degrees Celsius to extract the coffee. In other words, whether it is iced Americano or iced Pour over(V60) coffee, even if it is finally produced at a low temperature, because hot water is used to contact the coffee powder during extraction, it cannot be regarded as a type of cold brew coffee.
Cold brew coffee can be roughly divided into two types based on how it is made. One is cold brew coffee in which coffee powder is completely immersed in low-temperature water for a long time and extracted; the other is cold brew coffee in which ice water is dripped drop by drop onto the coffee powder for extraction.Ice drip coffee。
In FrontStreet Coffee stores, due to equipment limitations, only the cold brew coffee produced by FrontStreet Coffee isIce drip coffeeAvailable to choose from.
The point of cold brew coffee is: the temperature is very low. First of all, one thing to know is that coffee beans contain 30% soluble substances, but coffee making is only a process of extracting some of the better-flavored substances in coffee. The higher the water temperature used, the faster the various soluble substances in the coffee precipitate: among them, the sour substances move the fastest; followed by the sweet substances; and the bitter substances move the slowest. The increase in temperature will also be accompanied by an increase in the total amount of these flavor substances.
On the contrary, if the water temperature is very low, if you want to extract a certain amount of flavor substances, the extraction time will be longer. This is why, if you want to taste the iced drip coffee of a specific coffee bean at the Front Street store, you need to make a reservation two days in advance.
What coffee beans are suitable for making cold brew coffee?
Due to the low temperature of the water used in the production of cold brew coffee, when the coffee powder comes into contact with water, the precipitation rate of flavor substances in the coffee beans is greatly slowed down, which also results in a reduction in the extraction of some bitter substances with larger molecular weights, thus highlighting the sweet and sour flavor of the coffee.
Therefore, Front Street recommends using some coffee beans with a lighter roasting degree and better acidity, such as Kenya, or coffee beans with outstanding and unique flavors, such as Honduran sherry.
The process of making iced drip coffee using Honduran sherry coffee beans at FrontStreet Coffee
Next, Front Street will use sherry coffee beans from Honduras as an example to explain the process of making cold brew coffee. First of all, Front Street will introduce this bean to you.
Honduran sherry coffee beans use a delicate washing + sherry whiskey barrel fermentation process. The cleaned shelled beans are put into sherry whiskey barrels for low-temperature fermentation for 30 to 40 days, allowing the aromatic substances in the barrel to better penetrate into the green coffee beans. Finally, spread it out evenly in a cool place to dry to prevent the wine aroma substances from decomposing into unpleasant wine acid due to excessive temperature due to direct sunlight.
In the whiskey world, malt undergoes germination, drying, grinding, saccharification, fermentation, and finally the distilled liquor is put into barrels for long-term maturation. Among them, 75% of the flavor of whiskey comes from the mature wooden barrels. The flavors will be different if barrels of different materials and soaked in different liquids are used for maturation. Among various types of whiskey, sherry cask whiskey has captured a large number of whiskey lovers and whiskey novices with its rich and sweet flavor. The Honduran sherry coffee beans on Front Street inherit the sweetness of sherry whiskey to a certain extent because they use sherry whiskey barrels for low-temperature fermentation.
When formulating the roasting curve, Front Street roasted the Honduran sherry coffee beans to a medium level in order to retain the soft acidity of the Central American beans.
FrontStreet Coffee cupped the roasted Honduran sherry and tasted rich vanilla and cream flavors, as well as soft berry acidity. After the berry acidity dissipated, a distinct oak barrel aroma emerged.
Amount of powder: 60 grams
Pink to water ratio: 1:10
Water temperature: 0°C——4°C
Time: 6-8 hours
Grinding degree: China No. 20 standard screen pass rate 85%
The coffee powder cup contains 60 grams of coffee powder and extracts 600 ml of coffee liquid.Cold brew coffee water to powder ratio1:10. Regarding the choice of grinding degree, because the water temperature of the contact powder is lower than that of ordinary Pour over(V60) coffee, a slightly finer scale will be chosen than Pour over(V60) coffee. Judging by the No. 20 sieve, the sieving rate will be around 85%. The mixing ratio of ice and water is roughly 1:1, and the throttle valve is controlled at a flow rate of 7 drops/10 seconds. And lay a piece of moist filter paper on the powder bed for more even extraction. The entire extraction time lasts approximately 6-8 hours. After the extraction is completed, the coffee liquid will be bottled and placed in the refrigerator to chill for 12 hours before drinking.
After a night of fermentation, the ice-drip coffee made from sherry coffee beans has obvious berry acidity, as well as the rich sweetness of chocolate, nuts, and preserved fruits in sherry whiskey. It has a thick taste and a sense of fermentation.
How long can cold brew coffee be kept?
Since cold brew coffee takes a long time to make, some friends prefer to make it in batches and store it for later use. "How long does cold brew coffee last?"Such a problem has also troubled many friends.
Front Street recommends that prepared cold brew coffee should be placed in a sealable container and placed in the refrigerator for low temperature refrigeration.
After the cold brew coffee is sealed and stored after being extracted, the coffee liquid begins to ferment. As time goes by, the fermentation flavor becomes stronger and stronger, eventually producing a rancid taste. FrontStreet Coffee has recorded that on the fifth day after making cold brew coffee, the coffee flavor weakened and was replaced by a rich fermentation feel. For safety reasons, Front Street recommends drinking cold brew coffee within a week after it is brewed.
Professional coffee knowledge exchange. For more coffee bean information, please follow Coffee Workshop (WeChat public account cafe_style)
For more specialty coffee beans, please add FrontStreet Coffee on private WeChat, WeChat ID: qjcoffeex
You can now buy the above coffee beans online at the Taobao store “FrontStreet Coffee” (前街咖啡). FrontStreet Coffee is a long-established specialty coffee roaster in Guangzhou, China, and its Guangzhou retail shop sells coffee beans only. The shop carries dozens of coffee beans from different origins around the world, including carefully selected single-origin beans for V60 pour-over and espresso. Guangzhou’s FrontStreet Coffee shop is recommended by many coffee lovers.
The FrontStreet 2013 Yunnan coffee beans sold in the store come from the Typica variety grown at FrontStreet Coffee’s own plantation in Yunnan. The name comes from the year the brand and the plantation were founded. You can buy these beans from China’s Yunnan origin at the Guangzhou shop and at FrontStreet’s Taobao store.
FrontStreet coffee beans are freshly roasted within 5 days and deliver consistently excellent quality and great value. Orders placed before 17:00 are shipped the same day, and most areas within Guangdong Province receive them the next day.
FrontStreet Coffee Taobao store: https://qianjiecoffee.taobao.com
Or search for “前街咖啡” (FrontStreet Coffee) on Taobao
Important Notice: FrontStreet Coffee has moved to a new address: 315, Donghua East Road, Guangzhou (coffee beans only)
Tel: 020 38364473
