In coffee shops, you occasionally hear someone make a peculiar sound while drinking coffee—this is actually a tasting method called "slurping." Although it may not sound elegant, it genuinely helps us capture the flavors of coffee more fully. By changing the temperature and form of the coffee as it enters the mouth, slurping atomizes the liquid and accelerates the release of aromas, while also restoring the taste buds' sensitivity at the right temperature, enabling a clearer distinction of flavor layers such as sourness, sweetness, and bitterness. This article uses Front Street Coffee's Sidra beans as an example to walk you through the specific technique and principles of slurping, helping you understand why this seemingly crude method actually lets you get a head start on experiencing the richer, more delicate flavors in coffee. [more…]

Adding salt to coffee may sound unconventional, but it is a time-honored piece of drinking wisdom. This article will start from the science of taste to explain how salt weakens bitterness and enhances the perception of other flavors by activating taste buds, and review the history of 19th-century Europeans using salt instead of sugar because of the poor quality of coffee. At the same time, we will also explore why adding salt to milk coffee can bring a cheese-like savory and salty layer. Through actual testing, Front Street Coffee found that adding 0.1 grams of salt to a latte and frothing it together with the milk creates a clever balance between sweetness and savory saltiness, adding a completely new experience to coffee. [more…]

Many coffee enthusiasts encounter a phenomenon when tasting pour-over coffee: as the temperature drops, the flavor of the coffee seems to change, sometimes even developing an unpleasant sourness. This is not a problem with brewing technique, but rather a series of physical and chemical changes that coffee undergoes as it goes from hot to cold. Front Street Coffee will take you on an in-depth look at the processes of aroma loss, oil oxidation, pigment polymerization, and condensation after coffee cools, while also explaining from the perspective of sensory science why the perception of sourness, sweetness, and bitterness on the taste buds changes with temperature. Through this article, you will understand the real reasons why coffee becomes sour or bitter after it cools, allowing you to view the relationship between coffee temperature and flavor more rationally and improve your tasting experience. [more…]

When you order an espresso at a coffee shop, it is often served with a small glass of ice water. This seemingly simple pairing actually embodies the scientific principles of coffee tasting. The ice water does not directly clean the palate; rather, it stimulates saliva production through the cold temperature, and the enzymes in the saliva help clear residual particles from the mouth, allowing us to perceive the coffee's flavors more accurately. This is especially true for the highly concentrated espresso, where lingering volatile compounds in the mouth can interfere with the taste buds and retronasal olfactory judgment. Drinking ice water beforehand can effectively enhance flavor perception. This article will provide an in-depth analysis of the mechanism by which ice water functions in coffee tasting, and how this small gesture can help you experience the aroma and layers of the coffee itself more fully. [Image 1] [more…]

When tasting pour-over coffee, you often hear the saying "you should drink it from hot to cold." This is not without reason—as the coffee liquid gradually cools, our taste buds' perception of acidity, sweetness, and bitterness quietly changes as well. So how exactly does temperature affect the presentation of flavor? What temperature range is best for drinking? This article starts from the scientific perspective of taste perception, combines Front Street Coffee's brewing and tasting experience, analyzes the flavor change patterns of pour-over coffee at different temperature stages, and offers recommendations on the best drinking temperature and timing to help you more fully capture a cup of coffee's layers and details. [more…]

Many people are used to being told that coffee should be drunk while it is hot, because once it cools, the flavor seems to deteriorate. But what exactly happens to coffee after it cools? How does temperature affect our perception of bitterness, acidity, and sweetness? What roles do aroma loss and the congealing of oils play? Starting from a tasting case of Front Street Hamashu, this article explains the real reasons why the taste of hot coffee changes as it cools, and clarifies that not all coffee tastes bad when it goes cold. If you also want to improve your tasting ability, the article also recommends several Front Street single-origin beans with highly distinctive flavors, helping you experience the full character of coffee at different temperatures. [more…]

Is the sourness in coffee good or bad? Some people believe that sourness means the coffee is not fresh, while others regard it as a hallmark of high-quality coffee. In fact, green coffee beans themselves are rich in organic acids, most of which decompose or disappear after roasting, leaving only a limited variety of organic acids in the final cup. The latest research shows that there are not many acids that our taste buds can clearly identify, and much of the fruity acidity we perceive actually comes from the combined association of sourness with other flavors. The latest SCA cupping form classifies acidity into two categories—"sweet type" and "dry type"—helping us more accurately judge whether a coffee's acidity is good or bad. This article, from the professional perspective of Front Street Coffee, will provide an in-depth analysis of the sources of coffee acidity and the criteria for evaluating it. [more…]

A freshly brewed cup of hot coffee sits and gradually cools, its aroma fading and its taste deteriorating—pouring it out feels wasteful, yet reheating it risks damaging the flavor. What changes does coffee actually undergo from hot to cold? At what temperature is coffee most ideal to drink? And what should you watch out for when reheating it a second time? Starting from Front Street's everyday experience and drawing on how temperature affects taste perception, this article analyzes why coffee's acidity and bitterness intensify and its aroma dissipates after cooling, and offers different rewarming temperature ranges for medium-light and medium-dark roasts, helping you enjoy as smooth a cup as possible without letting anything go to waste. [more…]

Drinking coffee while it's hot is the only way to enjoy it—this is the consensus among many coffee lovers. But when a pour-over goes from scalding hot to lukewarm, or even completely cold, what exactly happens to the flavor? When coffee goes cold, some people try to rescue it by reheating it—is this approach viable? From the professional perspective of Front Street, this article breaks down in detail the differences in how taste buds perceive sweetness, acidity, and bitterness across different temperature ranges, analyzes the deterioration in mouthfeel caused by aroma loss, oil oxidation, and precipitation of soluble compounds after coffee cools, and uses a tasting example of Sidamo Alo to illustrate the concrete flavor expression at each stage—high temperature, medium temperature, and low temperature. At the same time, the article offers practical advice on reheating, providing reference temperature ranges for warming back up according to the different characteristics of medium-light roasts and medium-dark roasts, helping readers minimize waste as much as possible while preserving the pleasant experience a cup of coffee should have. [more…]

Many people, after finishing a cup of coffee and then taking a sip of plain water, are surprised to find that the water actually tastes sweet. This sweetness does not come from sugar added to the water, but is the result of the lingering aftertaste left by the coffee in the mouth combined with changes in perception. Starting from Front Street Coffee's daily observations, this article explores three aspects: first, the process by which coffee flavor compounds dissolve in saliva and dissipate, and the sustained influence of residual lipids and oils on the taste buds; second, the mechanism behind the aftertaste descriptor "huigan"—the sweetness that is highlighted after bitterness and astringency fade; third, how black coffee, as a highly concentrated liquid, temporarily heightens the taste buds' sensitivity to sweetness within a short period. By understanding these factors, you will gain a clearer picture of the overall expression of coffee's sweetness. [more…]

Sour, sweet, bitter, salty, and umami—among the five basic tastes, umami has always been a controversial topic in coffee. In the specialty coffee wave, "umami" occasionally appears in flavor descriptions, and the word has even been seen on the packaging of Front Street Coffee's Panama Geisha. Can coffee really taste umami? This article starts with the scientific origins of umami, sorts out the relationship between glutamate and taste thresholds, analyzes the essence of umami perception in coffee, and reveals how saltiness "disguises" itself as umami, helping you understand the complex layers of coffee flavor more accurately. [more…]

When buying coffee beans at a coffee shop or a Front Street location, many coffee enthusiasts ask the same question: for single-origin pour-over coffee, is it better hot or iced? Why is the flavor of hot pour-over coffee often more intense and prominent than iced pour-over? This article will start from the effects of coffee temperature on taste bud perception and aroma volatilization, deeply analyze why hot drinks make it easier to taste flavor, and at the same time explain the special adjustments in brewing parameters for iced pour-over—how operations such as reducing the amount of water, increasing the ratio of grounds to ice, and grinding finer affect the final flavor performance. The article also takes Front Street Ethiopia Huakui as an example, separately presenting a comparison of tasting results between hot brewing and iced brewing, to help readers fully understand the respective flavor characteristics and suitable scenarios of the two brewing methods. [more…]

Good coffee should be drunk while it's hot, as that allows you to better appreciate its rich flavors and mouthfeel—this is a saying that Front Street Coffee often has on the tip of its tongue. Although Front Street Coffee still hasn't been able to completely ditch short sleeves even now, as autumn and winter draw nearer, in the chilly indoor space, a freshly brewed hot coffee has only been drunk for a short while before, in the blink of an eye, [more…]

On a scorching summer day, with temperatures approaching 40 degrees Celsius, would you rather pick up a glass of iced coffee or a hot coffee? Most people's instinct would be to choose a cold drink to dispel the heat, yet scientific research gives the exact opposite answer: a hot beverage may actually be the truly effective way to cool down. This article explores in depth the pros and cons of iced coffee versus hot coffee in summer from the perspectives of taste perception, the principle of ice dilution, and the body's sweating and evaporation mechanisms, and analyzes why some people insist on drinking hot coffee in the sweltering heat. Whether you are a loyal fan of iced coffee or a staunch supporter of hot coffee, this discussion about temperature and how it feels to the body is worth a read. [more…]

People new to specialty coffee are often puzzled: why can others taste citrus, jasmine, oolong tea? Can a cup of coffee really have so many flavors? In fact, the key to identifying coffee flavors lies not in the taste buds, but in the sense of smell. This article will take you from the principles of sensory perception to understand how the taste buds and orthonasal and retronasal olfaction work together, introduce tasting dimensions such as aroma, sweetness, acidity, mouthfeel, flavor, aftertaste, and balance, and offer sensory-training methods that beginners can put into practice—building a flavor memory bank, making good use of the coffee flavor wheel, exercising associative thinking, accumulating through more exchanges, and paying attention to diet and upkeep. The article also combines examples from Front Street Coffee to help you build your own sensory system step by step. [more…]

At what temperature does coffee taste the most fragrant? This is actually closely tied to how our taste buds perceive flavor. The tongue's sensitivity to sweet, sour, and bitter changes with temperature, and since aromas are released to different degrees at different temperatures, hot pour-over coffee has an ideal tasting range. From the perspective of Front Street, this article explains how temperature affects flavor, analyzes why freshly brewed coffee shouldn't be drunk right away, and answers related questions about thermos cups, reheating, and iced pour-over. Finally, Front Street will also share its consistent advice on "hot vs. iced." [more…]

When tasting a new bean, why is it recommended to choose a hot brew first? This article delves into the flavor differences of black coffee made by pour-over, French press, siphon, and other methods under hot brewing and iced brewing from the perspectives of extraction yield, concentration, water temperature parameters, and so on. Taking pour-over coffee as an example, the article specifically compares the different settings of hot brewing and iced brewing in terms of coffee-to-water ratio, grind size, water temperature, and other parameters, and explains why iced brewing often requires sacrificing part of the extraction yield in exchange for higher concentration. At the same time, it also explores the influence of temperature on aroma, taste, and aftertaste, explaining why hot coffee can more fully present the complete picture of a bean. [more…]

After a freshly brewed cup of coffee sits for a while, its aroma gradually dissipates, and its mouthfeel changes noticeably. Dark roasts become less smooth, medium-light roasts develop a more pronounced sourness and astringency, and a bitter, muddled finish may even appear. Why does cooling rob coffee of its appeal? If you reheat cold coffee or chill it with ice, can it regain its original flavor performance? This article analyzes the issue from two perspectives—chemical changes and sensory perception—and, through a comparative experiment between Front Street Coffee Kafa Forest and Front Street Coffee Yirgacheffe, explores practical remedies for cooled coffee. [more…]

In the world of coffee tasting, there is a unique drinking method known as "slurping," in which coffee is quickly drawn into the mouth to atomize it, thereby maximizing the release of volatile aromatic compounds and allowing the taste buds and olfactory nerves to capture coffee flavors more fully. Front Street Coffee has touched on this method when sharing knowledge about coffee flavors. This article will explain in detail the techniques of slurping, the science behind it, and its practical value in cupping and everyday drinking, while also exploring whether this tasting method is suitable for ordinary coffee enthusiasts in their daily routine, along with related recommendations. [more…]

Freshly brewed hot coffee is rich in aroma and smooth in taste, but as the temperature drops, the flavor gradually becomes flat and even harsh. This is due not only to the effect of temperature on taste bud perception, but also to the continuous loss of volatile flavor compounds in the coffee. So, how long is it best to finish a pour-over coffee? And how much longer can a thermos extend the "enjoyable window"? Front Street Coffee conducted a real-world test using a thermos that keeps coffee hot for 12 hours, preheating all contact vessels in advance to faithfully reproduce actual performance. This article will break down the reasons why coffee flavor deteriorates after cooling and provide practical reference for thermos storage. [more…]