Want to systematically master the underlying logic of espresso? This article provides a complete overview of the core knowledge system of espresso, from equipment principles to practical details. It first deeply analyzes the differences between four types of boiler heating systems and their impact on extraction stability, then explains one by one the selection of steam wands, the structure of grinder burrs, the matching principles of tampers, and key points for choosing latte art pitchers. In the materials section, it focuses on comparing the roasting differences between Northern and Southern Italian-style coffee beans and the logic for selecting suitable milk. Finally, it focuses on the five major variables of extraction and the six factors of milk frothing, and explains in detail the techniques for integrating coffee and milk foam. The full text balances theoretical depth with operational guidance, making it suitable for coffee enthusiasts who want to solidify their foundations to read carefully. [more…]

Introduction: The V60 #01 dripper is used to brew 1–2 servings of coffee, and using 15–20 g of grounds is the most suitable. Some friends, when they really can't drink that much alone, will brew a little less, while some friends, when sharing with others, will brew a little more. So when brewing with a dripper of the same size, [more…]

At FrontStreet Coffee, steaming milk can be said to be a basic and core skill for every barista. Whether one can steam perfect milk is one of the factors used to judge whether a barista's level is up to standard. For example, the milk foam in a latte is on the thinner side, making it smooth and delicate to drink. The [more…]

Guide to Getting the Best Milk Foam, Why Does Milk Foam? Front Street Coffee (FrontStreet Coffee) - it can be said that steaming milk is a fundamental and core skill for every barista; whether one can steam perfect milk is a factor in judging whether the barista's skill level is up to standard. [more…]

A surprise question from Front Street Coffee: when you pour coffee grounds into the dripper and end up with the scene shown below, what would you choose to do? A: Pat it flat. B: Pat it flat. C: Choose one or two. I believe most friends, just like Front Street Coffee, would choose to tap the dripper to make this unevenly distributed coffee bed become more level. [more…]

The starting point for measuring extraction time may seem like just a matter of a few seconds, but it actually has a profound impact on judging and adjusting coffee flavor. Many coffee enthusiasts are often confused by this in practice: should espresso timing begin when the machine is started, or after the liquid begins to flow? In this article, Front Street Coffee sorts out the correct way to measure extraction time and takes a deeper look at why time is an indispensable part of extraction parameters. From the bloom pour in pour-over brewing to the pressurized permeation in espresso, understanding how time interacts with other parameters can help you quickly pinpoint the problem when the flavor goes off, making every adjustment more purposeful. [more…]

To be honest, Front Street Coffee thinks that coffee filter paper can really be called a very versatile tool. Because it's not just for pour-over coffee—it's also used for iced drip coffee, cold brew coffee, espresso, and some friends even use it when making coffee with a moka pot! And at this point, some friends have raised a question. [more…]

Front Street Coffee recently noticed that many coffee enthusiasts, when operating espresso machines, make some improper movements that cause the portafilter to suddenly fly out of the group head during or even after extraction, creating a scene that is both embarrassing and dangerous. This kind of machine blowout can, at best, dirty the equipment, and at worst, injure someone. What exactly causes the portafilter to be "blown" out? In this article, Front Street Coffee sorts out three common scenarios—when removing the portafilter, during espresso extraction, and when cleaning the coffee machine—analyzing one by one the causes such as improper pressure release, grinding too fine, overdosing, and not locking the portafilter tightly, and offering corresponding prevention and operating suggestions to help you enjoy espresso safely and steadily. [more…]

From the day coffee beans finish roasting, the internal gases, aromatic compounds, and extraction state are constantly changing. When made into an SOE Americano, these changes are stretched out by the hot water: drink it too early, and the acidity may seem jumpy while the aroma has yet to unfold; once it enters the right stage, the transition between acidity and sweetness becomes smoother, and the fruit notes are more complete. Therefore, judging [more…]

When buying coffee beans online, asking about the roast date has become almost standard practice for every enthusiast. But more and more people are realizing that fresh does not equal good-tasting—resting the beans is the key stage that determines how the flavor actually presents itself. Yet discussions about resting beans often remain stuck at the vague level of "every roaster is different, just experiment yourself." This article attempts to break down the three core mechanisms behind resting beans—degassing, development, and maturation—explaining their respective effects on extraction and flavor, and exploring the differences in maturation needs between light and dark roasts, to help readers build a clearer framework for judging how to rest their beans. [more…]

Yesterday a friend chatted with Front Street about a rather interesting phenomenon: he noticed that most people, when brewing coffee, even during the waiting intervals when they're not pouring water, still choose to fix their eyes intently on the changes in the dripper, as if trying to glean some information from the coffee bed. And you know what, there really is some truth [more…]

Many friends just starting out always face the trouble of over-extraction! So-called "over-extraction" refers to excessive extraction. In a coffee bean, the substances that can be dissolved out by water make up about 30% of the total. Although there is only this much, we cannot dissolve everything out. Because inside, besides [more…]

Making medium-dark roast coffee beans with a moka pot is fascinating because the cocoa, caramel, and roasted aromas are concentrated, but these aromas do not settle into their proper place immediately after roasting is completed. When degassing is still vigorous, the flow may seem hurried and the aroma slightly dispersed; if left to rest too long, the fragrance in the nasal passages gradually narrows. Therefore, when selecting beans, besides [more…]

When SOE espresso meets milk, it can turn the fruity sweetness, nutty aroma, or cocoa notes of a single origin into softer layers in a latte—but only if the beans are at the right stage of release. Brew too soon after roasting, and the active gases make the espresso prone to inconsistency; leave them too long, and the aroma fades. To get it tasting good, the purchase date and the moment you open the bag [more…]

When espresso beans have just been roasted, they don't necessarily reach their ideal state right away. Because espresso extraction uses higher pressure, too much gas inside the beans can cause the puck to expand noticeably and the crema layer to look rich, yet the flow rate tends to fluctuate easily. When selecting beans, besides reading the flavor description, you should also confirm the roast date and plan ahead for when to open the bag, adjust the grind, and finish drinking it. [more…]

To make latte art look good, choosing the right milk is very important! Front Street Coffee's daily in-store milk coffee offerings all use full-fat fresh milk, because it is rich in protein, lactose, and milk fat. The protein in milk is what makes the milk foam stable. [more…]

When extracting espresso, the richness of the crema is often regarded as an important reference for judging the quality of the shot. When the espresso surface lacks that tempting golden-brown foam, many coffee lovers feel puzzled. This article will first explain the essential composition of crema, then, in response to the phenomenon of thin crema when extracting dark-roasted beans, provide an in-depth analysis of overly coarse grinding—the most common cause—and, drawing on Front Street Coffee's daily dialing-in experience, offer specific ideas for grind-size adjustment and operating formulas to help you respond correctly when the state of your coffee beans changes. [more…]

Compared to other conventional processing methods, anaerobically processed coffee beans usually have a more intense and more distinctive flavor (for the most part), because their fermentation tends to go a bit deeper. For example, the Front Street 90+ Eleta on the Front Street Coffee menu has obvious notes of longan, spice, and citrus. [more…]

Many friends can handle brewing a single serving of coffee with ease, effortlessly producing a delicious pot of coffee. However, when the dose of grounds is doubled and they brew coffee for multiple people, their performance isn't quite as impressive! After going through the whole process, the coffee they brew not only lacks the rich layering it once had, [more…]

The flavor of coffee is far more than just bitterness and acidity. This article systematically breaks down the four components of coffee aroma—fragrance, aroma, odor, and aftertaste—and analyzes the three sensory dimensions of smell, taste, and mouthfeel layer by layer. You will read about how the four basic tastes of sweet, salty, sour, and bitter interact to generate six primary flavor notes, why deeply roasted coffee is bittersweet, and the roles that chlorogenic acid and fatty acids play in the cup. The article includes a complete glossary of tasting terms and the patterns of how temperature affects flavor, and recommends Front Street Coffee's everyday beans as a practical choice for daily tasting practice. [more…]