The update to the coffee flavor wheel has made the tasting system more complete, but many people still feel confused when faced with descriptions like citrus, berries, and nuts. In daily brewing, Front Street Coffee recommends beans from different regions based on guests' taste preferences, while accurately identifying flavors requires systematic training. This article starts with the four major taste spectrums—sour, sweet, bitter, and salty—and, combined with the complete classification of the new flavor wheel, interprets one by one the specific expressions of floral, fruity, herbal, nutty and cacao, sweet, spice, sour and fermented, alcoholic fermentation, roasted, and other categories, helping coffee enthusiasts build a clear framework for flavor perception. [more…]

Heytea recently launched a seasonal limited-edition drink, Litsea cubeba Yunnan papaya, combining western Yunnan sour papaya, Xishuangbanna litsea cubeba, Lingnan fresh carambola, and litsea cubeba pea jelly. Officially, it is positioned as having a distinctive sweet-and-sour taste. However, after the new product hit the market, evaluations on social media quickly split into two extremes: some were put off by the piercing sourness, some chose "less less less sweet" yet tasted only sweetness, and the sugar-free version was criticized for being overall too sweet with the fruit aroma not standing out. Why can the same cup of drink deliver such wildly different impressions as "sugar-free salted lemon Seven Up," "flat salt soda," and "hot and sour noodles"? This article sorts through feedback from all sides and explores how fresh fruit batches and individual differences in sourness tolerance affect the final flavor of this limited edition. [more…]

Many coffee enthusiasts have encountered this confusion: you go to a café and order a black coffee, and it tastes so sour it makes you frown, yet the barista says this is just how coffee is supposed to taste, and that if you drink black coffee you have to accept the sourness. At the same time, some roasters claim that coffee beans are fruit, that they only have acidity and sweetness, and that any bitterness is a sign of bad beans. Do these claims really hold up? This article will, from the perspectives of the nature of coffee beans, the chemical changes during roasting, and the flavor characteristics of different origins, help readers clarify the relationship between "sour coffee" and "good coffee," and teach you to distinguish between a quality "fragrant acidity" and a "dead acidity" caused by negative factors. [more…]

Is the acidity in coffee a plus or a minus? It depends on the quality of the acidity, not its intensity. This article approaches the topic from a cupping perspective, explaining the difference between acidity and acid quality, showing how coffee acidity is influenced by variety, altitude, processing method, and roast level, and revealing the relationship between fruity flavors and the balance of sweetness and acidity. At the same time, it recommends acidic coffee beans categorized by acid quality type: bright citrusy washed high-altitude light roasts, juicy full-bodied dark berry notes, and high-sweetness sun-dried beans blended with tropical fruit notes, helping coffee lovers choose beans precisely according to their preferences. [more…]

Many coffee enthusiasts notice that certain coffees seem to become more sour after they cool down. But this is not a universal trait of all coffee—most coffees simply lose some aroma as they cool, without their flavor framework shifting dramatically, and some even reveal greater sweetness as the temperature drops. So why does the sourness of certain coffees rise noticeably after the temperature falls? Behind this lies both the way human perception changes with temperature and the flavor composition of the coffee itself. From the perspective of Front Street, this article sorts out how temperature affects the perception of sourness, sweetness, and bitterness, explains the principle behind the intensified sourness of light-roasted coffee after cooling, and offers directions for adjustment when coffee is too sour. [more…]

Americano coffee is deeply associated with a bitter, full-bodied impression, but many people feel puzzled when they drink an Americano with a sour taste: is this normal? In fact, coffee beans naturally contain abundant acidity, and both roasting and extraction methods affect the final flavor expression. This article will start with the sources of sourness and the dissolution order of bitter, sweet, and sour compounds, then systematically sort out practical methods for adjusting coffee that is too sour, including key points such as choosing the roast level, controlling water temperature, grind size, coffee-to-water ratio, and extraction time. At the same time, it will introduce the currently popular SOE Americano trend and share several Front Street Coffee espresso blends suitable for making Americanos, along with their brewing suggestions. [more…]

The coffee flavor wheel is known as the "flavor dictionary" of specialty coffee and is an indispensable professional tool in cupping and quality control. Based on Front Street Coffee's cupping practice, this article systematically breaks down the structure of the SCA coffee flavor wheel. Starting from the four major taste spectra of sour, sweet, bitter, and salty, it analyzes the causes and representative bean varieties of each flavor category, covering all categories including floral, fruity, nutty/cocoa, sweet, spicy, sour and fermented, alcoholic fermentation, roasted, and defective flavors. It also provides practical methods for building a flavor memory bank from everyday life and improving sensory identification ability, helping coffee enthusiasts more accurately describe the flavor characteristics and taste categories of pour-over coffee. [more…]

The coffee flavor wheel is a recognized tasting tool in the specialty coffee community, but when faced with descriptors like citrus, berries, nuts, and chocolate, many people don't know how to match them. Starting from the high-resolution image of the latest SCAA flavor wheel, this article systematically sorts out the compositional logic of coffee flavor: the relationship between the four basic tastes of sour, sweet, bitter, and salty and the roast level, the proportion data of each taste substance, the subdivision of the acidity spectrum, bitterness spectrum, sweetness spectrum, and saltiness spectrum, as well as an item-by-item analysis of the nine major flavor groups including floral and fruity, green and herbal, nutty and cocoa, sweet, spicy, sour and fermented, alcoholic fermented, roasted, and other. The article also intersperses Front Street Coffee's daily training methods and representative bean recommendations, helping readers build a complete tasting framework from smelling to drinking. [more…]

Professional barista exchange, please follow Front Street Coffee (FrontStreet Coffee). Many friends have asked Front Street's baristas: "Can you really taste so many flavors in the beans? How do you taste them?" First, this is about personal sensory perception. As everyone grows up, [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…]

What exactly determines whether coffee is sour or bitter? Many people think that Ethiopian beans tend to be sour and Mandheling tends to be bitter because of their origin, but the real dominant factor is actually the roast level. This article starts with the development phase after first crack and explains how the length of the development phase affects the caramelization reaction, thereby determining whether the coffee's flavor leans sour or bitter. At the same time, using Kenya, Blue Mountain, and Mandheling as examples, it explains that dark roasting is not a cover-up for poor quality—sweetness within bitterness and a rich, balanced cup are what these classic beans insist on. Front Street Coffee also shares related insights in the article. [more…]

Americano may have already become the mainstream choice in coffee shops. Especially in summer, a glass of iced Americano is definitely a refreshing treat. Coffee has become a daily habit for many people—sometimes it's about enjoying the slow moments of life, and sometimes it's about adding a boost of mental energy to a疲惫 life of day-night reversal. No [more…]

Many coffee enthusiasts enjoy a well-balanced pour-over in cafés, with its harmonious blend of acidity and sweetness, yet when they brew at home, they often end up with a sharp, jarring sourness that leaves them puzzled. In reality, the flavor of coffee depends on the proportions of three types of substances: acids, sugars, and bitters. Sharp sourness is often a sign of imbalance—it’s not necessarily that there are too many acidic compounds, but rather that not enough sweet and bitter substances have been extracted. Front Street Coffee will take a deep dive into the principles behind sharp sourness and, from three angles—lowering the coffee-to-water ratio, extending the extraction time, and raising the water temperature—provide concrete, actionable adjustments to help you brew a smooth, mellow pour-over at home. [more…]

Many friends who are new to specialty coffee often wonder: if coffee tastes sour, has it gone bad? In fact, sourness is not synonymous with spoilage, but rather a highly prized flavor dimension in specialty coffee. Drawing on the practical experience of Front Street Coffee, this article systematically sorts out the sources of coffee acidity, distinguishes good acidity from bad, and analyzes how factors such as roast level, grind size, water temperature, and brewing time affect the expression of acidity. At the same time, the article also introduces several African-origin coffee beans known for their bright fruity acidity, helping readers build a correct understanding of coffee sourness and stop confusing acidity with spoilage. [more…]

When drinking coffee, have you ever encountered a familiar yet indescribable aroma? In fact, perceiving coffee flavors requires systematic cognitive training. In daily cupping and roasting adjustments, Front Street Coffee places particular emphasis on the ability to identify coffee flavors. This article starts with coffee's four major tastes—sour, sweet, bitter, and salty—and, combined with the classification logic of the flavor wheel, breaks down in detail 36 common aroma names across floral, fruity, green/vegetal/herbal, nutty/cocoa, sweet, spicy, sour/fermented, alcoholic fermentation, roasted, and other categories, along with specific representative coffee beans and Front Street's tasting suggestions, to help you more accurately describe and enjoy a cup of coffee's layers and lingering finish. [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…]

Jasmine Naibai recently launched a floral special blend "Green Mango and Wampee Iced Tea" that combines Hainan green mango, Guangxi wampee, and Yunnan sour papaya, highlighting a sweet-and-sour, refreshing taste. Each of the three sour fruits has its own character, making many sour-loving consumers eager to try it. However, after the new product launched, reviews have been polarized: some praise its tangy, refreshing quality that cuts through greasiness, while others report tasting a fishy note similar to houttuynia or fish mint. Interestingly, the netizens complaining about the fishy taste mostly come from the north, while staff and some consumers point the finger at the herbal note naturally present in Guangxi wampee. So how does this new product actually taste? Let's take a look together. [more…]

A freshly brewed pour-over coffee is full of aroma and smooth on the palate, but after sitting for half an hour it turns sour, astringent, and muddled—what's going on? In fact, coffee naturally presents different flavors at different temperatures, and during tasting it is often divided into three stages: hot, medium, and cool. A good cup of coffee can usually withstand all three temperature stages, but once it has fully cooled, the flavor goes beyond the normal tasting range. From Front Street's perspective, this article breaks down the root causes of coffee turning sour and developing astringent, muddled notes after cooling—including differences in how human senses perceive sourness, sweetness, and bitterness, the impact of aroma volatilization, and the three key mechanisms of oil oxidation, pigment oxidative polymerization, and condensation—and tells you the most suitable temperature for drinking coffee, helping you better capture the best flavor of every cup. [more…]

Walking into Front Street Coffee (FrontStreet Coffee), faced with more than 50 kinds of coffee beans on the menu, many first-time visitors often don't know where to start. How exactly are coffee flavors described? What are the characteristics of the four major taste spectra: sour, bitter, sweet, and salty? Where do the flavor differences among beans from the world's three major coffee-producing regions come from? And which groups of people are suited to the three major varieties Arabica, Robusta, and Liberica? Starting from Front Street Coffee's tasting experience, this article systematically sorts out the logic behind the formation of coffee flavors and the characteristics of the varieties, and offers drinking suggestions for older coffee lovers, helping you find your own cup in the dazzling world of coffee. [more…]

Is coffee actually bitter, sour, or sweet? With the same pot of coffee, different people often taste completely different things. This article starts from the causes of sweetness in coffee cherries and sorts out how variety, altitude, processing method, and roast level affect the retention and transformation of sugars in coffee beans. It focuses on explaining why medium and medium-light roasts are more likely to present flavors in a sweet direction, and recommends specific beans such as Front Street Strawberry Candy, Front Street Blackberry, and Front Street Mozart. It also explains the difference between sweetness and the perception of sweetness, analyzes the "sweet aftertaste" of bitter coffee, the sweet-sour balance of sour coffee, and how orthonasal and retronasal olfaction participate in judging sweetness, helping coffee lovers describe the sweetness of hand-brewed black coffee more accurately. [more…]