We usually talk a lot about coffee bean brewing, but today Front Street Coffee will explain coffee bean roasting knowledge to everyone. We know that the process of coffee beans going from green beans to roasted beans is the roasting process, and this process includes light roast, medium roast, and dark roast. Exactly how should different coffee beans be roasted? At the same time, light roast, medium roast [more…]

Coffee mysticism has long become a commonplace topic in coffee circles, and the most discussed aspects are flavor mysticism and brewing mysticism. Front Street is here to help everyone unveil the surface-level mysticism and reveal the underlying science. Flavor mysticism generally refers to when you drink a cup of coffee and only taste bitterness and sourness, while the person next to you [more…]

For more specialty coffee knowledge, please follow: Front Street Coffee (Frontsteet Coffee). In the past, when Front Street shared knowledge about espresso extraction, it focused on parameters such as grind size, dose, ratio, extraction time, and pressure, and also provided in-depth analysis of steps like receiving the grounds, distributing the grounds, and tamping. [more…]

Among city coffee enthusiasts, some love the life ritual of pour-over, the laboratory feel of operating a siphon, while others prefer the convenience and simplicity of a French press. Yet the mystery of each coffee brewing device goes beyond appearance and technique; making coffee is more like a science, and each device has its own way of extracting coffee. [more…]

Among city coffee lovers, some enjoy the life ritual of pour-over, the laboratory feel of operating a siphon, while others prefer the convenience and simplicity of a French press. And the wonders of each coffee brewing device go beyond appearance and technique—making coffee is more like a science, and each device has its own way of extracting coffee. [more…]

For more specialty coffee knowledge, please follow our WeChat public account: Front Street Coffee (FrontStreet Coffee). Those who have read Front Street's popular science articles may have noticed that Front Street rarely specifies exact extraction times the way it does when explaining pour-over coffee, because espresso extraction is about more than just [more…]

很多人选择喝咖啡，核心诉求就是摄入咖啡因。关于烘焙程度是否影响咖啡因含量，坊间长期存在两种截然相反的说法：一方认为深烘豆咖啡因更多，另一方则坚持深烘会减少咖啡因。咖啡科学与信息协会曾用同一款阿拉比卡豆分别做浅、中、深三种烘焙并检测，结果浅烘仅比深烘高出0.06个百分点。但若把失重率、萃取效率一并纳入考量，结论又会发生变化。真正决定咖啡因含量高低的关键，其实在于豆种本身。本文将逐层拆解这些变量，帮你厘清烘焙度与咖啡因之间的真实关系。 [more…]

The appearance of the siphon coffee maker is just like the scientific instruments of scientists from hundreds of years ago seen in history books, with a classical aura. In fact, the siphon coffee maker really has a history of about 200 years. Who designed and invented siphon coffee? The basic principle of the siphon coffee maker is to use the phenomenon of vacuum siphon. [more…]

不少人觉得深烘咖啡喝起来更苦，就理所当然地认为它的咖啡因含量更高。但事实真的如此吗？咖啡的苦味来源并不只是咖啡因，烘焙过程中产生的其他化合物才是苦味主力。本文从前街的视角出发，结合咖啡科学与信息协会的研究数据，详细拆解烘焙程度与咖啡因含量之间的关系，并进一步分析为什么冲泡后的深烘咖啡，咖啡因总量有时反而可能超过浅烘咖啡，最后也为咖啡因不耐受的朋友提供了实用的低因咖啡选择建议。 [more…]

咖啡烘焙远不只是加热那么简单，它让生豆在物理与化学两个层面经历一系列剧烈转变。本文作为系列首篇，聚焦烘焙过程中的物理变化：从颜色由蓝绿转为棕褐，到含水率从10-12%骤降至约2.5%，再到细胞壁由刚性变为橡胶态、体积膨胀、孔隙增多、油脂向表面迁移。这些结构层面的改变并非孤立发生，它们为梅纳德反应和焦糖化反应等化学过程提供了必要前提。理解物理变化，才能真正读懂烘焙曲线与最终风味的关联。 [more…]

Drip bag coffee is a portable pour-over coffee made by grinding roasted coffee beans to a suitable coarseness, then packaging the grounds in specially designed drip bag coffee packets that are individually sealed. The coffee brewed from drip bag packets is generally black coffee with no sugar, no milk, and no additives. The benefits and drawbacks of drinking drip bag coffee, according to "The Aroma of Coffee [more…]

For more specialty coffee knowledge, please follow: Front Street Coffee (Frontsteet Coffee). Cold brew coffee is so popular for one reason: whether in a coffee shop or at home, its brewing method is extremely simple. Another reason is the flavor that cold brew coffee delivers, which has not only won over many coffee connoisseurs [more…]

For more specialty coffee knowledge, please follow our WeChat official account: Front Street Coffee (FrontStreet Coffee). A while ago, a Starbucks report showed that cold drinks now account for 70% of total beverage sales. Among them, cold brew coffee is increasingly favored by the new generation of consumers. A simple [more…]

What is the first step in brewing coffee? Grinding beans. In recent years, with the rise of the specialty coffee wave, more and more people have come to enjoy drinking coffee, and at the same time, more and more people hope to fully experience the beauty and leisure of drinking coffee, so they choose to buy coffee beans and brew them at home. And so at this point, a [more…]

I wonder if everyone has heard this saying: pour-over is easy to get started with but hard to master. It means that anyone can brew coffee, but wanting to brew a delicious cup of coffee freely and according to your own vision is actually very difficult. There aren't many factors that affect pour-over coffee, and among them, water temperature is one of the four major elements of brewing. Hand [more…]

As one of the representatives of iced coffee, cold brew is usually made with room-temperature water (around 20–30°C), but because the extraction efficiency is low, a long steeping time is needed to extract more flavor compounds, so as to highlight the coffee's sweetness and body. Experienced friends know that making a pot (cup) of cold brew quickly [more…]

Previously, when Front Street shared knowledge related to espresso extraction, it would focus on the effects of parameters such as dose, ratio, grind, time, and pressure on extraction. In addition, it also emphasized analyzing the key operational points in steps such as receiving the grounds, distributing the grounds, tamping, and locking the portafilter into place. Only water temperature was something Front Street always [more…]

For more specialty coffee knowledge, please follow our WeChat official account: Front Street Coffee (FrontStreet Coffee). No matter what equipment is used to brew coffee, the coffee beans need to be ground, and the purpose of this is to allow the coffee's flavor substances to dissolve more quickly. Of course, not all of the coffee's soluble [more…]

For more specialty coffee knowledge, follow our WeChat public account: FrontStreet Coffee (FrontStreet Coffee) No matter what equipment is used to brew coffee, the coffee beans must be ground, the purpose being to allow the coffee's flavor compounds to dissolve more quickly. Of course, not all of the coffee's soluble [more…]

"Which coffee on the menu has the least caffeine?" "I really want to drink coffee, but I'm afraid I won't be able to sleep at night if I do~" In the eyes of most people, coffee is a beverage consumed precisely for its stimulating effect, but its own aroma also attracts a group of friends who pursue delicious flavors, among whom there are quite a few who are intolerant to caffeine yet "greedy for a taste" [more…]