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As we all know, the reason coffee can keep us awake is thanks to caffeine. Caffeine is a central nervous system stimulant commonly found in coffee, tea, and chocolate. When we drink beverages containing caffeine, it is quickly absorbed into the bloodstream, crosses the blood-brain barrier, and enters the brain, where it takes effect.

The reason we feel tired or drowsy is mainly that a molecule called adenosine in the body binds to receptors. When caffeine gets to the adenosine receptors first, it inhibits the transmission of fatigue signals and keeps the brain alert. In addition, caffeine can promote the release of the neurotransmitters dopamine and norepinephrine, both of which can improve our attention and concentration. This is why after drinking coffee, we feel like we've been injected with adrenaline and work twice as efficiently.

For this reason, there are generally two ways to get a boost: one is to drink a few more cups, and the other is to choose a coffee beverage with a higher caffeine content, such as cold brew and ice drip. For reference, cold brew coffee (one cup with 20g grounds/200ml coffee liquid) contains about 140mg of caffeine, while a cup of Americano has about 100mg, so cold brew is clearly more invigorating.

So what is cold brew coffee?

Cold brew coffee, known in English as Cold Brew Coffee. Cold brew coffee is made by grinding coffee beans into powder and soaking them in cold water for more than 8 hours. If you want a fuller body, you can also extend the time to 24-48 hours. After soaking is complete, we just need to filter out the coffee grounds and it's ready to taste. 

How does Front Street Coffee (FrontStreet Coffee) make cold brew coffee?

If you want to drink cold brew coffee but don't want to go out and buy it, then Front Street Coffee (FrontStreet Coffee) is here to teach you how to make cold brew coffee at home. Cold brew coffee is a very easy brewing method to master. Front Street Coffee's (FrontStreet Coffee) cold brew coffee is based on 50 grams of coffee grounds. For the grind size, because the water temperature in contact with the coffee grounds is lower than that of regular pour-over coffee, choose a slightly finer setting than pour-over coffee, that is, an 85% pass rate on a No. 20 standard sieve. Put the coffee grounds into a glass bottle, then add 400 ml of room-temperature water and 200 grams of hard ice cubes (600 grams total of ice-water mixture), with a coffee-to-water ratio of 1:12. Then use a stirring rod to mix the coffee grounds and water evenly, seal it, and place it in the refrigerator to chill.

  After placing it in the refrigerator for 12-24 hours, use filter paper to filter out the coffee grounds and obtain clean coffee liquid. Then use a clean sealed bottle to store the coffee liquid and refrigerate it for about 4 more hours before drinking. 

Here, Front Street Coffee (FrontStreet Coffee) needs to tell you, friends, that cold brew coffee is not better the longer it is extracted. Whether it tastes good or not is a very subjective matter. Some people like fresh and clean coffee, while others like bold coffee and coffee with a fermented feel. These all vary from person to person.

  For those who like a stronger fermented feel, Front Street Coffee (FrontStreet Coffee) recommends extending the extraction time a bit longer. As time extends, the fermented feel of the coffee liquid becomes stronger, but the coffee's concentration becomes richer and the mouthfeel layers become more complex. If, when drinking, you feel the coffee liquid is too strong, you can add two ice cubes. As the ice cubes melt, the concentration of the coffee liquid will decrease accordingly. Finally, people often ask Front Street: what coffee beans are suitable for cold brew? Based on Front Street's production experience, if you want delicious cold brew coffee, you can prioritize light-to-medium roasted coffee beans. If you like floral notes, we recommend Front Street Panama Geisha coffee, one of the most expensive coffees in the world;

If you like coffee with a fresh, acidic taste, we recommend Front Street Ethiopia Huakui coffee beans, with notes like black tea and berries, or Front Street Little Tomato with a full fruity juice feel; of course, there is also Front Street Sidra with passion fruit and fermented flavors.

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