Mandheling coffee is the representative coffee of Sumatra, Indonesia, in Asia, famous for its rich, substantial body and unique herbal and chocolate flavors. Is it actually bitter? How should it be brewed to taste good? Starting from the origin background of Front Street Mandheling, this article provides a detailed analysis of the differences between the Lintong producing region and PWN Golden Mandheling, the flavor changes at different roast levels, and the complete process and flavor formation of Sumatra's wet-hulling method. Finally, using pour-over as an example, it gives specific brewing parameters to help coffee lovers fully understand the character and charm of this classic coffee. [more…]

Canadian national coffee brand Tim Hortons has recently been trending frequently, from moldy food to outrageous employee behavior, its reputation has suffered a severe crisis. Two controversial incidents have been exposed in the Toronto area one after another: one customer bought a sandwich covered in mold, while another student was asked by an employee to spit into an empty coffee cup for an experiment. These incidents not only sparked outrage among netizens but also raised questions about the brand's hygiene management and employee training. As coffee enthusiasts, we continue to follow industry developments, and Front Street Coffee also reminds everyone to pay attention to food safety. This article will take you through the full picture of the incidents. [more…]

For more specialty coffee knowledge, please follow the WeChat official account: Front Street Coffee (FrontStreet Coffee). Mandheling is a coffee produced in Sumatra, Indonesia, Asia, so it is also called Sumatra coffee. Its main producing areas include Java, Sulawesi, and Sumatra. [more…]

Entering mid-December, temperatures across the country continue to drop, yet demand for iced drinks remains strong, and the ice machines in tea beverage shops still need to operate as usual in the severe cold of the north. Recently, an early-shift employee at Chagee arrived at the store and found the ice cube tray covered with foreign matter resembling a "spider web." Only upon closer inspection did they realize it was ice that had frozen into a thick layer overnight, preventing the machine from properly releasing the ice. This situation not only caught the staff off guard but also sparked discussions among peers about winter ice machine parameter adjustments, troubleshooting, and equipment quality. Front Street Coffee has noticed that similar problems are not uncommon in chain tea beverage stores, and how to respond scientifically has become a topic of concern for industry practitioners. [more…]

Mandheling coffee is a representative coffee of Sumatra, Indonesia, but many people are not clear about its variety classification, processing method, and brewing method. Starting from the producing region, variety, and wet-hulling process, this article explains in detail whether Mandheling belongs to Robusta or Arabica, and compares the differences between two Front Street Coffee Mandheling products—Lintong Mandheling and PWN Golden Mandheling. At the same time, through cupping comparisons of light, medium-dark, and dark roast levels, as well as the practical parameters of four brewing methods—pour-over, AeroPress, siphon, and French press—it helps coffee enthusiasts fully understand Mandheling's flavor characteristics and extraction key points. [more…]

Mandheling is one of the most representative coffees of Sumatra, Indonesia, known for its full body, low acidity, and spicy, herbal notes. This article explores the differences between Lintong Mandheling and Front Street Coffee's PWN Golden Mandheling in terms of origin, variety, processing method, and flavor, and explains in detail how the Sumatra wet-hulling process shapes their unique character, including the causes of peaberry beans and defect control. At the same time, Front Street Coffee conducts a brewing comparison of PWN Golden Mandheling using four methods—pour-over, AeroPress, siphon, and French press—presenting the flavor performance and extraction recommendations under different brewers, helping coffee enthusiasts gain a more comprehensive understanding of Mandheling. [more…]

Mandheling is the most iconic coffee from Sumatra, Indonesia, and Golden Mandheling is renowned for its strict hand-sorting standards and rich, full-bodied flavor. Starting with the PWN Golden Mandheling from Front Street Coffee, this article outlines its producing region, varieties, and wet-hulling process, and compares the performance of light, medium-dark, and dark roasts in pour-over brewing. It also provides five brewing methods commonly used in Front Street Coffee shops—pour-over, volcano siphon, AeroPress, siphon, and French press—including water temperature, coffee-to-water ratio, grind size, and timing parameters, helping coffee enthusiasts recreate the spice, nut, caramel, and chocolate notes of Golden Mandheling at home and find a brewing method that suits them. [more…]

Recently, a plastic washbasin offered by Mixue Bingcheng as a周边 (merchandise) for spending 15 yuan or more has sparked widespread discussion online. This plastic washbasin, printed with the brand's mascot Snow King, breaks the conventional impression that tea beverage brand merchandise must be exquisite and attractive, with its plain and simple appearance and highly down-to-earth positioning. Netizens verbally complained that it was "ridiculous," yet couldn't help placing orders. It is worth noting that this merchandise is not available in stores nationwide, but is concentrated in certain areas of Jiangsu and Zhejiang, which has made many fans envious. As a tea beverage brand known for low prices, affordability, and being down-to-earth, Mixue Bingcheng's move, though surprising, is actually quite reasonable upon reflection. This article will start from this phenomenon and explore the current state and changes of limited-edition merchandise from tea beverage brands. [more…]

Sumatra Golden Mandheling is renowned for its rich, full-bodied taste and distinctive herbal spice aroma, making it a favorite among coffee lovers who prefer bold flavors. However, the hot and humid environment of Sumatra poses significant challenges to coffee processing, doubling the washing and drying time, and any slight misstep can lead to over-fermentation or mold. Starting from the terroir of the production area, this article will analyze the difficulties of washed processing for Golden Mandheling and share Front Street Coffee's complete brewing method—from water temperature and coffee-to-water ratio to pouring techniques—to help you avoid the pitfalls of bitterness in dark-roasted beans and brew a cup of Mandheling with chocolate, cream, and caramel notes that is sweet and smooth. [more…]

As coffee consumption becomes increasingly widespread, food safety has naturally become a focal point of public attention. Recently, a post circulating on social media questioned whether the white spots on ice cubes in beverages were mold, quickly sparking heated discussion among netizens. In response, Luckin officially stated that the ice cubes have a hollow structure, and when preparing drinks, air or foam enters the grooves, causing light refraction that visually appears as white spots, which disappear after stirring. Meanwhile, an on-duty barista came forward to detail Luckin's ice machine cleaning procedures and handwashing standards, vigorously proving that the store's hygiene standards are strict. Whether this incident stems from consumer misunderstanding or hidden hygiene risks, opinions vary. Front Street will also continue to monitor food safety developments in the coffee industry, providing reliable information for enthusiasts. [more…]

As the Spring Festival approaches, courier services are gradually suspending operations, and many coffee lovers have already stocked up on beans in advance. But how to keep coffee beans fresh during this period has become a concern for everyone. Storing coffee beans requires avoiding three major enemies: high temperatures, moisture, and oxidation. High temperatures accelerate the loss of aroma, moisture easily leads to mold, and oxidation shortens the optimal flavor period. Front Street recommends that unopened original packaging be kept in a cool, dry place, and that an airtight container be used after opening. As for refrigeration or freezing, although it can slow oxidation, it comes with the challenges of absorbing odors and becoming damp during thawing. This article will break down these storage points in detail to help you enjoy the New Year with peace of mind. [more…]

Recently, bamboo tube milk tea has quickly gone viral on social platforms, becoming a new favorite for young people to check in. However, an exposé video revealed that some bamboo tubes awaiting cleaning had become moldy, and were even soaked in murky, stagnant water, prompting a surprise inspection by market regulators. Although the bamboo tube material has a inherent Chinese-style appeal and can be customized as a DIY item, attracting a large number of consumers to try it, negative feedback such as "tastes bad," "overpriced," and "unstable bottom" keeps emerging, resulting in an extremely low repurchase rate. Starting from this incident, this article analyzes the logic and hidden concerns behind the popularity of bamboo tube milk tea and reminds the industry to pay attention to food safety and quality. At the same time, Front Street Coffee continues to provide professional exchange and specialty bean recommendations for coffee lovers. [more…]

Recently, a distinctive coffee creation has been trending online—the white toast Dirty. It isn't made by adding toast to coffee; instead, milk that has been soaked with toast is used to make the Dirty, giving the milk both the aroma of bread and a richer mouthfeel. In this issue, Front Street Coffee replicates this drink, using raw toast soaked in a 1:5 ratio under refrigeration for 4 hours, then filtering it and pairing it with a specialty espresso blend, documenting the complete process of temperature contrast and flavor integration across three sips. However, Front Street also specifically warns that fresh bread is prone to mold, and soaking it in milk for a long time will greatly accelerate spoilage, posing safety risks if not handled properly, so friends with sensitive stomachs are advised not to try it casually. [more…]

In coffee roasting, understanding green bean characteristics is the foundation for developing a roasting strategy. Starting from the Front Street Coffee roasting course, this article provides a detailed analysis of how the three key indicators of green beans—moisture content, density, and size—affect heat transfer and flavor development, and systematically introduces the causes and harms of common defective beans such as shell beans, insect-damaged beans, moldy beans, black beans, and white-eye beans. Mastering this knowledge helps with proper screening and adjustment before roasting, ensuring the final coffee flavor is clean and rich. [more…]

When the southern "hui nan tian" (return of the damp) arrives, everything at home feels wet, and coffee beans are no exception—they too risk absorbing moisture and growing mold. If you want your pour-over coffee beans to last longer without their flavor fading, the way you store them becomes especially critical. This article centers on how to store coffee beans so they keep longer, starting with the real frustrations of Lingnan's humid climate, analyzing the pros and cons of common practices such as airtight canisters and refrigerator chilling, and warning about the fatal impact of fridge odors on coffee beans. It also draws on the product characteristics of Front Street Coffee to offer storage suggestions better suited to daily life, helping coffee lovers extend their beans' peak flavor period as much as possible in a humid environment. [more…]

Recently, a consumer discovered that a package of Costa's organic ripe Pu'er compressed tea was labeled with a shelf life of 100 years, with a production date of October 1, 2025, and an expiration date of October 1, 2125. This bizarre labeling quickly sparked questions: was it a printing error, or can tea cakes really be stored for a century? Customer service responded that "the older the tea, the more fragrant it is," but experts and lawyers both pointed out that the national standard for Pu'er tea only states "suitable for long-term storage," with no fixed number of years. A 100-year shelf life can neither be scientifically verified nor is it free from hidden food safety risks such as mold. At the same time, some e-commerce platforms still sell Costa Pu'er tea with a shelf life labeled as 9,999 days, which works out to more than 27 years. As coffee enthusiasts, Front Street Coffee also reminds you to pay attention to the compliance and scientific validity of beverage shelf-life labeling. [more…]

The washed processing method occupies a mainstream position in the specialty coffee field, and its workflow includes multiple stages such as bean selection, removal of pulp, fermentation, washing, drying, hulling, sorting and grading, and export. Washed coffee beans have stable quality and are not prone to mold, with a flavor profile that is clean and refreshing, bright in acidity, and accompanied by fruity notes, but the process is complicated and consumes a large amount of water, making costs relatively high. This article will take Butterfly Coffee from the Boquete producing region of Panama as an example to introduce separately the producing region information, variety composition, brewing parameters, and flavor characteristics of Front Street Coffee's Natural Butterfly and Washed Butterfly, helping coffee enthusiasts intuitively understand the taste differences of the same bean variety under different processing methods. [more…]

In the world of coffee, Indonesian Mandheling stands out with its solid, mellow body and unique herbal, woody aromas. Front Street Mandheling, the darkest-roasted single origin on the bean list, presents a character of low acidity, high body, and a long intertwining of bitter notes and sweetness. This highly recognizable flavor comes not only from the terroir of Sumatra's high-altitude growing regions, but more crucially from the region's unique wet-hulling process. This article will provide an in-depth analysis of the complete wet-hulling process, from the climatic background and semi-washed operation to the formation of the sheep's hoof bean, and explore how the humid environment, through mold and the Maillard reaction, ultimately creates Mandheling's signature funky aroma and regional taste. [more…]

Those new to specialty coffee are often confused by labels such as G1 and AA on the packaging. These letters and numbers actually represent the grading systems for coffee beans from different origins. Some countries grade by bean size, others by the proportion of defective beans, and still others by growing altitude. Take Mandheling as an example: Indonesia uses the wet-hulling process and grades beans from G1 to G6 based on the number of defects in 300 grams of green coffee. Geisha coffee, by contrast, is famous for Hacienda La Esmeralda's red, green, and blue label system. This article will systematically sort through these grading systems while taking a deeper look at the core differences in flavor and mouthfeel between Mandheling and Geisha, helping coffee lovers understand the logic of quality evaluation in specialty coffee more clearly. [more…]

I've tried quite a few Mandhelings, but aged Mandheling is a special existence that requires time to craft. It draws on the idea of Indian monsoon coffee: the green beans must be quietly aged in a ventilated, cool warehouse environment for 24 months, during which they are regularly turned to prevent mold and insect damage, consuming a great deal of labor. After this treatment, the beans' acidity is greatly reduced, their body is significantly improved, and their sweetness carries a honey aroma, with a flavor profile completely different from fresh beans. This time, Front Street Coffee used Sumatra Typica as the sample, roasting it medium-dark with 550g batch size in a Yangjia 800N roaster, and completed brewing with a KONO dripper at 88°C water temperature, ultimately presenting a cup that interweaves herbs and caramel. This article will fully break down the story behind this unique Mandheling, from the principles of the aged processing method, changes in the appearance of the green beans, details of the roasting curve, to the brewing parameters. [more…]