Fermentation is a core step in coffee processing that shapes flavor direction. It is driven by microorganisms such as yeasts and bacteria, which convert sugars and acids within the coffee cherry into acids and alcohols. Good, controlled fermentation can highlight a coffee's varietal characteristics, while uncontrolled fermentation may bring negative flavors reminiscent of spoilage and spoiled wine. Starting from the basic principles of fermentation, this article sorts out the differences between the two pathways—aerobic and anaerobic—and, around six major factors—coffee cherry quality, cleanliness, oxygen, microorganism and yeast types, time and temperature, and data recording—explains how to improve the consistency and repeatability of fermentation. It also emphasizes that coffee quality is largely fixed during the growth stage, and the role of fermentation is to extract and preserve excellent characteristics rather than to elevate quality out of thin air. The article also introduces Front Street Coffee's ongoing attention to knowledge related to fermentation and processing methods, for the reference of coffee enthusiasts. [more…]

Fermentation plays an irreplaceable role in coffee processing, directly influencing the final flavor profile and sensory quality of the coffee. How sugars and acids break down under controlled conditions, how microorganisms participate in the process, and why fermentation consistency matters so much for market partnerships—these are all key to understanding coffee quality. Drawing on the hands-on experience of Finca Black Mountain in Guatemala and Capricornio Coffee in Brazil, and incorporating the research perspective of agricultural engineering PhD Mauricio Villegas, this article systematically examines the mechanisms of coffee fermentation, common misconceptions, and methods for achieving reproducibility. Whether you are a coffee professional or a devoted enthusiast, you will gain a clear understanding of the relationship between fermentation and coffee quality. [more…]

Many people assume that only special processes like anaerobic fermentation involve fermentation, but in reality, conventional methods such as natural, washed, and honey processing are equally dependent on fermentation. Fermentation is the process by which microorganisms break down sugars and produce heat and compounds in the presence or absence of oxygen. Coffee cherries are rich in moisture and sugars, so fermentation begins the moment they are picked. Different processing methods correspond to aerobic or anaerobic fermentation pathways, and the duration and intensity of fermentation directly shape the flavor profile of the coffee—prolonged fermentation brings rich layers of dried fruit and fruit preserves, while short fermentation yields bright acidity and a clean mouthfeel. Properly controlled fermentation enhances quality, but once it becomes unbalanced, it produces irreversible negative flavors such as moldiness and rotten fruit. [more…]

Coffee processing methods have long ceased to be limited to natural, washed, honey, and wet-hulled techniques. In recent years, a method known as CM processing has gradually entered the public eye. CM stands for Carbonic Maceration, translated into Chinese as carbonic maceration processing, and it belongs to the anaerobic fermentation family. It allows coffee to present a richer layering of aromas while inhibiting the production of sharp acetic acid flavors. Since its introduction, this processing method has continued to evolve and has twice helped competitors reach the top of the World Coffee Championship, in 2015 and 2018. This article will systematically sort out the origins and development of CM processing from perspectives such as fermentation principles, microbial action, and fermentation differences among various processing methods, and explore its actual impact on coffee quality and flavor performance. [more…]

From the same estate, the same variety, and the same harvested batch of coffee cherries, the flavor in the cup can be as different as two distinct beans—simply because of a different processing method. This is the magic of coffee processing. In the microscopic world, it uses microorganisms and time to perform the alchemy of flavor. The washed method is the oldest mainstream technique, and its logic is "to do [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…]

Coffee green beans are not simply picked from the tree and then roasted and brewed right away; achieving good flavor requires many steps. People often assume that coffee flavor depends on variety, growing environment, and cultivation methods, but what they don't realize is that there is an important stage between growing and roasting called "coffee bean processing." [more…]

Sidama is one of Ethiopia's most representative specialty coffee regions, and behind its name lies a history of shifting identity from Sidama to Sidamo. This article will guide you through a comprehensive understanding of the unique appeal of Sidama coffee, from the region's proper name, to the influence of traditional natural processing on flavor, and the flavor profile of washed G1 grade. At the same time, we will also review several representative products from the Front Street brand in this region, such as Natural Huakui and Hamasho 74158, and describe their taste characteristics in detail. Whether you are a beginner just getting into single-origin coffee or a seasoned enthusiast in pursuit of regional flavors, this article will provide you with a complete knowledge framework and tasting reference for the Sidama region. [more…]

Where does coffee flavor come from? The processing method is often the decisive factor. As the two mainstream techniques, natural and washed processing each shape distinctly different aromas and tastes. This article will systematically compare the differences in process and flavor characteristics between these two processing methods, and for pour-over enthusiasts, put together five naturally processed coffee beans worth trying, covering producing regions such as Ethiopia, Panama, Brazil, and Yunnan, China. Each one comes with detailed origin information and flavor descriptions to help you quickly lock in your preferred choice. [more…]

When selecting coffee beans, many enthusiasts often prioritize natural (dry) processing in pursuit of a more pronounced sweetness. But are natural beans really inherently sweeter than washed beans? What exactly is the source of this sweetness? This article will delve into the impact of natural and washed processing methods on coffee flavor from the perspectives of green bean chemical composition, sugar metabolism during processing, and fermentation mechanisms, while also exploring how roasting and extraction stages influence the final sweetness expression, helping readers gain a more comprehensive understanding of the complex relationship between coffee processing methods and flavor. [more…]

A milk coffee is made up of nothing but espresso and milk, so choosing the right coffee beans and milk is crucial. Not only do different ingredients create differences in flavor, but different ratios also affect the final strength of the coffee. As for what milk is suitable for a latte, let's start with milk—it makes up at least three-quarters of a latte. [more…]

When you drink a cup of coffee in a café with bright acidity and a clean mouthfeel, experienced tasters can often immediately tell that these are washed beans. What exactly does the washed process do to coffee beans that makes them present such distinct fruity acidity in the cup? Starting from the structure of the coffee cherry, this article breaks down the complete washed process step by step, compares the differences between dry and wet processing methods, and explores in depth the formation mechanisms of organic acids during fermentation. The article also introduces the Kenyan-style washed process, which takes wet fermentation to the extreme, helping you understand the real reason why washed coffee beans have such prominent acidity, and includes brand information for Front Street Coffee for reference. [more…]

On October 18, Feihe Dairy issued a statement regarding false information circulating online about "imported Japanese raw materials" and other rumors, stating that it had reported the matter to public security authorities and that a case had been opened. The controversy stemmed from a letter of intent for technical cooperation signed between Feihe and Japan's Kyowa Hakko, which was originally intended for the joint research and development of fermented lactoferrin technology, but was distorted into claims of raw material imports and even capital injection. Feihe emphasized that the cooperation remains only at the letter-of-intent stage and does not involve raw materials or capital. As a representative of domestic infant formula, Feihe has long been committed to breaking dependence on imported lactoferrin, as demonstrated by its first domestic production line. This article will sort through the ins and outs of the incident and restore the facts. [more…]

In recent years, anaerobic fermentation and red wine processing methods have continued to gain popularity in the specialty coffee world. From the promotion by 2015 WBC champion Sasa Sestic to the early explorations of Costa Rican coffee farmers, these processing techniques, which draw on winemaking ideas, have brought coffee rich flavors such as strawberry jam, fermented wine aromas, and tropical fruits. This article systematically reviews the scientific principles of anaerobic fermentation, its essential differences from traditional processing methods, and the specific operational workflow of carbonic maceration. It also combines two representative beans from Front Street Coffee—Colombia Flower Moon Night and Panama Hartmann—to share roasting and brewing parameters, helping coffee lovers gain a deeper understanding of the core logic of this special processing method. [more…]

The flavor profile of a milk coffee ultimately depends on two core ingredients—espresso and milk. In a latte, milk often accounts for more than three-quarters of the drink; it must both carry the coffee's aroma and retain its own sweetness, while the coffee beans directly determine the flavor foundation of the entire beverage. Milk on the market falls into two categories: pasteurized fresh milk and ultra-high-temperature (UHT) sterilized shelf-stable milk, and the two differ noticeably in nutrition, mouthfeel, and shelf life. As for coffee beans, because a latte contains a large amount of fresh milk, the espresso needs sufficient body and fullness, making medium-dark or dark roasts more suitable. This article will go through the logic of choosing milk one by one, along with blend recommendations for different flavor orientations, to help enthusiasts find a milk coffee solution that suits them. [more…]

Front Street Mandheling and Huakui are two beans with strikingly different styles in the specialty coffee world. The former is known for its herbal aroma and full body, while the latter has gained popularity for its rich fruity notes and bright acidity. This article analyzes the essential differences between these two coffees layer by layer, from origin background and processing method differences to flavor causes and pour-over parameters. Mandheling comes from Sumatra, Indonesia, and uses the unique wet-hulling method; Huakui originates from Ethiopia and preserves rich fruitiness through natural processing. The article also explains in detail their respective roasting logic and brewing plans, helping coffee lovers understand why the same bean can present the two poles of bitter and acidic flavors. [more…]

Tieguanyin is a highly representative member of the oolong tea family, originating from the high-altitude mountainous regions of Fujian and renowned for its orchid fragrance and sweet taste. It is a semi-oxidized tea, with an oxidation level between that of green tea and black tea, retaining freshness while adding mellowness. Many tea lovers wonder: does Tieguanyin contain caffeine? The answer is yes, but in moderate amounts, roughly half that of coffee. This article will explore Tieguanyin's varietal characteristics, factors affecting its caffeine content, health benefits, and brewing techniques, along with product recommendations from the Front Street brand, to help you gain a comprehensive understanding of this tea and brew a cup full of floral aroma. [more…]

Mandheling coffee, as the darkest-roasted single-origin bean on Front Street Coffee's menu, is renowned for its rich, solid mouthfeel and distinctive stuffy aroma. It originates from Sumatra, Indonesia, where the hot, rainy climate has given rise to a unique semi-washed processing method—wet hulling. This technique removes the parchment from the coffee beans before they are fully dried, greatly shortening the processing cycle but also introducing more defects and flavor variability. It is precisely this interweaving of "roughness" and "contamination" that gives Mandheling its regional flavor—a blend of wood, spice, earth, and herbs. This article will take you through every stage of wet hulling and reveal the origins of Mandheling coffee's unique flavor. [more…]

This article begins with the fact that in 2022, the wholesale price of Arabica coffee beans on the New York Intercontinental Exchange fell below $1 per pound, reviews the current price situation in the green coffee bean trade market, and explores in depth the sanitary handling, storage conditions, and purchasing channels for green beans. The article also offers suggestions on practical issues such as green bean washing and temperature and humidity control, while reminding industry practitioners to raise their awareness of coffee bean food safety, helping coffee enthusiasts and industry professionals gain a more comprehensive understanding of the key stages of green beans from import to before roasting. [more…]

On a hot summer day, cold brew coffee becomes a favorite for many people. But how long can prepared cold brew be stored? What details should be noted when making ice drip and cold brew at home? This article provides a detailed explanation of the shelf life of cold brew coffee, the role of refrigerated aging, the flavor differences brought by different bean varieties, and the extraction parameters and grind size for ice drip and cold brew. At the same time, Front Street Coffee also gives specific suggestions based on the cold brew performance of its own beans such as Kenya, Strawberry Candy, and Gitiding Cooperative. Whether you are a beginner or a seasoned enthusiast, you can find practical references here. [more…]