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…]

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…]

Coffee fermentation processing is a key step that determines the final flavor, and different processing methods bring completely different taste experiences. Starting from the basic principles of fermentation, this article systematically sorts out the characteristics of dry fermentation and wet fermentation, and analyzes in detail the specific processes and flavor trends of the three common processing methods: natural, honey, and washed. Whether you are a beginner coffee enthusiast or a seasoned player hoping to refine your brewing skills, understanding the differences among these processing methods can help you more accurately select and taste coffee beans. The article also specifically introduces the unique features of Ethiopian-style and Kenyan-style washing, as well as related product recommendations from Front Street Coffee, taking you into the wonderful world of green coffee processing. [more…]

In recent years, an increasing number of specialty green coffee beans processed with special processing methods have appeared on the specialty coffee market. Is this really something to be happy about? Front Street Coffee believes that special processing methods were originally intended to give the flavor of coffee beans from a certain producing region more distinctiveness. However, as their use has continued to expand, some processing methods today seem to be more about masking the defects of the coffee beans themselves and then selling them at a high price. In fact, all special processing methods have evolved around the three traditional methods: washed, natural, and honey. This article will systematically sort out the most common types of special processing methods on the market, including anaerobic fermentation, barrel fermentation, and red wine processing, and, combined with Front Street Coffee's cupping experience and specific products, analyze their processing procedures and flavor characteristics. [more…]

Coffee enthusiasts' taste demands are becoming increasingly refined. The original terroir flavors produced by traditional washed and natural processing methods can no longer satisfy diverse expectations, and various specialty processing methods have emerged as a result. From the perspective of Front Street, this article systematically reviews the principles and classifications of anaerobic fermentation processing, compares the differences between natural fermentation and temperature-controlled fermentation, and provides an in-depth analysis of three processing workflows: anaerobic natural, anaerobic washed, and anaerobic enzyme-washed. At the same time, using Front Street Huayueye coffee beans from the Huila region of Colombia and Rose Valley coffee beans from Big Tree Estate as examples, it presents a complete approach from green bean processing to roasting curve selection, and then to pour-over parameter development, helping readers understand how specialty processing methods shape the flavors in the cup. [more…]

Kenyan coffee is renowned for its vibrant acidity and clean cup profile, and its distinctive flavor is largely attributed to the iconic 72-hour washed processing method. Known as double washing, this technique uses two rounds of fermentation and two rounds of rinsing, allowing the coffee beans to shed their mucilage while boosting acetic acid concentration, thereby shaping an unforgettable fruity character and bright acidity. This article breaks down the complete process of Kenyan double fermentation in detail, explains why the total time can reach 48 to 72 hours, and introduces the AA grade classification standards. At the same time, using Front Street Kenya Small Tomato Coffee as an example, it shares practical parameters and flavor performance for hot pour-over, helping coffee enthusiasts gain a more comprehensive understanding of this bean's processing logic and drinking approach. [more…]

In the specialty coffee world, barrel-fermented processing methods have attracted considerable attention in recent years, and the origins of this technique can be traced back to Finca San José in Colombia. The third-generation female owner of the estate was the first to try placing green coffee beans into rum oak barrels for low-temperature fermentation, pioneering a distinctive processing method. This article will provide a comprehensive introduction to Finca San José's regional background, the development of the Castillo variety, the specific process of fine washing combined with rum barrel fermentation, and compare its flavor differences with the barrel-aged beans from Finca Moca in Honduras. At the same time, Front Street Coffee will share the optimal extraction parameters and flavor performance of this bean through brewing experiments at three different water temperatures, helping coffee enthusiasts gain a deeper understanding of this unique Colombian coffee. [more…]

Kenyan coffee is famous for its bright, clean fruit flavors. Behind this lies not only high altitude and excellent varieties, but also masterful washed processing techniques. Kenya commonly uses double washing, which means re-soaking fermented beans in clean water for a second wash, and later variations such as K72 washing and dry fermentation washing emerged. How exactly do these differently named processing methods differ from conventional washing? From the perspective of Front Street, this article first sorts out the origins and steps of traditional washing, then analyzes the procedures and flavor characteristics of double washing, K72, and dry fermentation one by one, helping you understand the processing logic behind the unique fruit acidity of Kenyan coffee. [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…]

In the world of specialty coffee, barrel-fermentation processing has attracted much attention in recent years, and the pioneer of this technique was not Honduras' Moca estate, but rather El Finca San José in Colombia's San Caldas region. In a moment of inspiration, the estate's third-generation female owner placed green coffee beans into rum oak barrels for low-temperature fermentation. After repeated experiments, she ultimately created the distinctive rum barrel-fermented coffee. This article will guide you through the background of Finca San José, the birth of barrel fermentation, the origins of the Castillo variety, and Front Street Coffee's pour-over performance and brewing recommendations for this bean at different water temperatures, helping you gain a more comprehensive understanding of this uniquely flavored Colombian specialty coffee. [more…]

Anaerobic Fermentation has been very popular in the coffee world in recent years, mainly because Sasa Sestic, the Australian competitor who won the 2015 WBC, started this trend, and even in 2018 WB [more…]

Anaerobic fermentation processing is a green bean processing technology that has attracted much attention in the coffee industry in recent years. Since Sasa Sestic, the 2015 WBC champion, brought it to the forefront, it has quickly swept through the specialty coffee world. Inspired by red wine-making techniques, this processing method injects carbon dioxide into a sealed container to expel oxygen, creating an oxygen-free environment that allows precise control of the fermentation process, giving coffee beans higher sweetness and more unique flavor layers. As processing technologies continue to evolve, experimental methods such as anaerobic natural, anaerobic washed, and double anaerobic have emerged one after another, each presenting distinctly different flavor expressions. This article will systematically sort out the principles and origins of anaerobic fermentation, and analyze one by one the process steps and flavor characteristics of these three common anaerobic processing methods, while also explaining them in conjunction with specific Front Street Coffee bean offerings. [more…]

As the most classic method of green bean processing, the washed method has won the favor of many coffee lovers with its outstanding cleanliness. With the development of specialty coffee, new names such as double washed, K72 washed, and dry-fermented washed have emerged on the market. How exactly do they differ from conventional washed processing? This article will start with the historical origins of the traditional wet process and gradually break down the operational procedures and flavor characteristics of these derived techniques, helping you clarify the logic behind different washed methods. Front Street Coffee will also combine its own production experience to help you understand how the fermentation stage shapes the acidity and sweetness of a cup of coffee. [more…]

The washed process is one of the most traditional and most favored methods of green coffee processing in the specialty coffee world, and Kenya, as an important producing region for washed processing, has developed a variety of improved techniques such as double washed, K72 washed, and dry fermentation washed. What are the origins of these variously named processing methods? How do they differ from conventional washed processing? And what flavor expressions do they each impart to coffee? From the perspective of Front Street, this article will trace the historical origins of the washed process, break down one by one the procedural characteristics and cup presentations of the various Kenyan washed techniques, and help you more clearly understand the logic and appeal behind these processing methods. [more…]

Kenyan coffee is renowned for its clean, complex fruity flavors. Behind this lies not only the advantages of high altitude and varietals, but also masterful washed processing techniques. From traditional wet processing to double washing, K72 washing, and then to water-saving dry fermentation washing methods, how do the subtle differences in the fermentation stage affect the cup performance? Front Street Coffee guides you through the origins and distinctions of these processing methods, and recommends two representative beans, Kenya Cherry Tomato and Asaliya, to experience the bright acidity reminiscent of cherry tomatoes, preserved plums, and smoked plums. [more…]

Kenyan coffee is renowned for its bright acidity and clean mouthfeel, with the K72-hour double washed method being the key to its flavor. This article provides a detailed explanation of this processing method's two fermentation and two washing stages, explaining how fermentation time control affects the coffee's acidity and cleanliness, and introduces the Kenya AA grading standard. At the same time, combined with Front Street Coffee's Kenyan Little Tomato coffee, it provides hot pour-over parameters and flavor descriptions to help readers understand the complete flavor logic from processing method to cup. [more…]

As one of the most traditional green bean processing methods, the washed process significantly enhances coffee quality and cleanliness through its depulping and washing steps, making it highly favored by enthusiasts. With the rise of the specialty coffee wave, new terms such as double washed, K72 washed, and dry fermentation washed have emerged endlessly—how exactly do they differ from traditional washing? From the perspective of Front Street, this article first traces the historical origins and procedures of traditional washing, then delves into the origins, operational details, and flavor expression of Kenyan double washing, and further introduces the characteristics of K72 washed and dry fermentation washed, helping readers understand how variables such as soaking time and number of soaks in the fermentation stage shape the final flavor of coffee. [more…]

The quality of black tea depends to a large extent on whether the fermentation stage is precisely controlled. Properly fermented black tea has a sweet aroma, a yellowish-red liquor, and a bright orange-brown infused leaf; failed fermentation reveals sourness or mustiness, a dark brown liquor, and a deep black infused leaf. Starting from the formation mechanisms of theaflavins and thearubigins, this article explains the origin of the floral and fruity aroma of black tea, clarifies how humidity and degree of oxidation influence the direction of flavor, and points out which subtle deviations in the irreversible chain of polyphenols → theaflavins → thearubigins can lead to a decline in quality. At the same time, the article also provides practical methods for judging fermentation results by observing the liquor color and infused leaf, helping coffee and tea enthusiasts understand the craft logic behind a good cup of black tea. In its black tea selection and brewing recommendations, Front Street Coffee also often emphasizes the decisive role of fermentation degree in aroma expression. [more…]

The rum barrel-fermented washed beans from Front Street Coffee's San Jose estate in Colombia are a highly representative example of the low-temperature anaerobic fermentation trend in recent years. They originate from a bold idea by the estate's owner, Monsalve Botero—placing green coffee beans into oak barrels for low-temperature fermentation. These beans use Supremo-grade Castillo and Naranjal varieties, which are fermented in barrels after depulping, then washed and dried on raised beds, revealing flavors of rum, cantaloupe, and dark chocolate. This article will review the origins of the processing method, the characteristics of the green beans, their unique performance in roasting and brewing, and explore the possible causes behind their rich vinous notes. [more…]

The red wine process is a method of processing green coffee beans that draws on winemaking concepts, and currently only a few estates in Colombia have successfully commercialized it. Depending on the fermentation environment, it can be divided into three types: acetic acid fermentation, lactic acid fermentation, and mixed fermentation, each presenting distinctly different flavor characteristics. At the same time, the washed method and the semi-washed method (honey process) remain the most mainstream processing methods in the specialty coffee field, and many of Front Street Coffee's representative beans use these techniques. This article will systematically sort out the classification and flavor performance of the red wine process, and compare the processing flows of washed and semi-washed methods, to help coffee enthusiasts more clearly understand the impact of processing methods on the flavors in the cup. [more…]