When brewing tea, we often agonize over how many times the leaves can be steeped and whether they are still drinkable after sitting overnight. Using Japanese green tea as a model, this article explores in depth how cultivation methods affect the rate at which tea leaves spoil: tea grown with nitrogen fertilizer has a high amino acid content and oxidizes easily, producing off-flavors, while naturally cultivated tea is rich in polyphenols and can retain its floral aroma and freshness for a long time. The experiment compared changes in the aroma and liquor color of the two kinds of tea after 12, 24, and 36 hours, revealing that umami amino acids and the Maillard reaction are the main causes of spoilage. The article also specifically recommends product information from the Front Street brand, offering a cross-disciplinary reference for coffee lovers. Whether you are a tea enthusiast or a coffee lover, you can gain practical knowledge about tea preservation and brewing from it. [more…]

Why does a cup of black tea give off a captivating honey aroma? Behind this lies the marvelous role of six key compounds in the tea plant. Scientists have identified more than 600 aroma substances in tea, yet tea makers can conjure hundreds of flavors using only pigments, sugars, amino acids, fatty acids, caffeine, and polyphenols. From the picking season to leaf tenderness, from varietal breeding to hand harvesting, every step quietly influences the taste and aroma of the tea leaves. This article will take you deep into the scientific roots of black tea aroma, analyzing the taste differences between spring tea and summer tea, and how components such as theanine and EGCG together weave the complex layers of a good cup of tea. Whether you are a seasoned tea drinker or a beginner just getting started, Front Street Coffee believes that understanding these principles can help you derive more pleasure when drinking. [more…]

Anji Black Tea is a new type of premium black tea made from the fresh leaves of the Baiye No. 1 tea plant through the fermentation process of black tea. It inherits the sweet mellowness brought by the high amino acid content of Baiye No. 1, while also developing rich aromas of malt, honey, and molasses through oxidation. Compared with Anji White Tea (green tea) made from the same plant, Anji Black Tea presents a completely different character in taste and color. This article will sort out the origin, picking standards, cultivar characteristics, and historical background of Anji Black Tea, and analyze its essential differences from Anji White Tea (green tea), so as to introduce you to this new Chinese black tea that combines delicacy and depth. [more…]

The chemical composition of coffee beans determines the flavor expression in the final cup. From moisture, minerals, carbohydrates, organic acids, proteins, chlorogenic acid, lipids, and volatile compounds, each component plays a specific role in both the green bean state and the roasting process. Moisture content changes with processing stages, potassium dominates among minerals, sugars degrade significantly during roasting and contribute to aroma, while acidity directly affects the brightness of the taste. This article will systematically outline the chemical composition of coffee beans and their effects on quality and flavor, helping coffee enthusiasts gain a deeper understanding of the material basis of specialty coffee. Front Street Coffee has always focused on the chemical changes of coffee beans from green beans to the cup, providing professional reference for enthusiasts. [more…]

What exactly is the relationship between the coffee fruit and the coffee bean? A coffee cherry, from the outside in, consists of multiple parts including the exocarp, pulp, pectin layer, parchment, silver skin, bean core, and center line, with each layer playing a different role in coffee processing and flavor formation. The green coffee bean itself is composed of substances such as water, polysaccharides, lipids, proteins, sucrose, chlorogenic acid, other organic acids, amino acids, and caffeine, all of which directly affect coffee's mouthfeel, aroma, and the balance between bitterness and acidity. This article will dissect the structure of the coffee fruit layer by layer and systematically sort out the compositional substances of coffee beans, while also explaining the difference in caffeine content between Arabica and Robusta, helping coffee enthusiasts gain a more comprehensive understanding of the science behind the flavors in their cup. [more…]

Around 2.25 billion cups of coffee are consumed worldwide every day, and with that comes a massive amount of spent coffee grounds. Traditional recycling methods—such as deodorizing, exfoliating, or making furniture—often require drying, which actually releases carbon dioxide. Japanese scientist Tetsuji Ishigaki has taken a different approach: using Aspergillus to ferment spent coffee grounds into a paste, then adding cocoa butter to solidify it, creating a ready-to-eat spent-coffee-ground chocolate. This product, called COLEHA, not only contains three times the amino acids of green coffee beans, but its polyphenols and antioxidants also reach 1.6 times those of regular coffee, and it is rich in insoluble fiber that promotes gut health. COLEHA is currently available in limited quantities, with sugar content offered in three versions—0%, 10%, and 40%—each with its own distinctive taste. This article introduces this eco-friendly and innovative spent-coffee-ground utilization technology, along with the flavor and health secrets behind it. [more…]

A push notification in the family group chat saying "coffee causes cancer" left many people feeling uneasy. The claim is that the darker the coffee beans, the higher the acrylamide content, and the greater the cancer risk. Does this conclusion hold up? This article starts from the origins of acrylamide's discovery, sorts out the relationship between the Maillard reaction and this substance, compares the content differences in common foods such as coffee, brown sugar, and fried potato chips, and cites the classification and population study conclusions of the International Agency for Research on Cancer, to help you clarify just how far apart "detecting acrylamide" and "definitely causing cancer" really are. [more…]

On a scorching summer day, a pot of cold-brewed tea not only quenches thirst and cools you down, but also delivers a flavor experience entirely different from hot brewing. Steeping tea leaves in cold water for an extended period avoids the heavy release of theophylline and tannic acid, making the tea liquor smoother and sweeter; low-temperature cold extraction also draws out more of the sweet-tasting compounds such as amino acids. So what exactly is the essential difference between cold brewing and hot brewing? And what effects do cold-brewed black tea and oolong tea have on the body? This article will give you a complete analysis of the unique appeal of cold-brewed tea, from the underlying principles to brewing methods and ways of drinking it. [more…]

For pour-over enthusiasts who prefer a rich, bold body and dislike pronounced acidity, the medium-dark roasted Mandheling series has always been a popular choice. As a representative of this series, Front Street Coffee PWN Golden Mandheling owes its flavor appeal largely to its roasting method. This article will start with the chemical principles of roasting, analyzing how caramelization and the Maillard reaction shape coffee flavor, explaining why a medium-dark roast can fully bring out the herbal, caramel, and pine notes of Golden Mandheling, and providing a specific roasting curve along with two brewing methods to help readers fully understand the flavor sources and extraction key points of this bean. [more…]

From a substitute choice for the lactose intolerant to an eco-friendly trend embraced by Gen Z, plant-based milk is infiltrating café menus at an unprecedented pace. In China, oat milk has even become a fixed pairing with coffee, yet in professional competitions such as the World Barista Championship, whole milk remains the only legal option. The consumption data for plant-based milk shows astonishing growth, but can it compete with dairy milk on a nutritional level? Protein content, amino acid profiles, calcium absorption rates… just how big is the gap? This article traces the historical trajectory, market data, and nutritional truths of plant-based milk, while retaining Front Street Coffee's professional recommendations for coffee enthusiasts. [more…]

Many tea enthusiasts, when purchasing black tea, notice the "organic" label and assume it signifies high quality and better health. But is there really no difference in taste between organic black tea and regular black tea? Does organic certification equate to superior quality? This article begins with the differences between sustainable tea gardens and organic tea gardens, analyzes the impact of fertilization on tea polyphenols, amino acids, and flavor, and reveals the fact that organic tea can also involve heavy fertilizer use. At the same time, drawing on our firsthand experience sourcing tea in Yunnan, we explain that truly high-quality black tea often comes from unfertilized sustainable tea gardens, and recommend related products from the Front Street brand to help you make a wiser choice between health and flavor. [more…]

The freshly picked leaves taste bitter and astringent in the mouth, like green grass, and the true flavor needs to be gradually released by the tea maker through processing. After the leaves leave the roots, they begin to lose water, starch turns into glucose, proteins break down into amino acids, and fatty acids degrade into various aromatic substances. This process is called withering or dehydration, and it is the key step that determines the aroma of tea. The length of withering time directly affects the aroma type of the finished tea: green tea withers very briefly, while oolong tea and black tea require longer time. Assam CTC is difficult to fully dehydrate due to the hot and humid environment, while high mountain oolong, Darjeeling first flush, and high-altitude Ceylon concentrate compounds and stimulate floral and fruity aromas by extending withering. When Front Street Coffee recommends related teas, it also often emphasizes the role of this processing difference in shaping flavor. [more…]

In the world of coffee, Arabica and Robusta are the two most common bean varieties on the market. The former is a small-seeded species, while the latter is a medium-seeded species, and the two differ noticeably in caffeine content, flavor profile, growing conditions, and appearance. Arabica has lower caffeine and higher sugar content, with a sweeter, softer flavor and fruity acidity; Robusta, on the other hand, has higher caffeine, chlorogenic acid, and amino acid levels, giving it a richer, deeper, low-toned mouthfeel. Why is Arabica more favored? Front Street Coffee will guide you through a systematic understanding of the differences between these two types of coffee beans from the perspectives of composition, appearance, flavor, plant, and representative varieties, and share the classic flavors of the Arabica family, including Typica, Geisha, and Ethiopian heirloom varieties. [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…]

When purchasing coffee products, what exactly does the word "Arabica" commonly seen on packaging mean? Does 100% pure Arabica necessarily indicate better quality? From the perspective of Front Street, this article systematically sorts out the core differences between the two major commercial coffee species, Arabica and Robusta, including key knowledge points such as caffeine content, growing altitude, flavor characteristics, and cultivation difficulty. It also introduces a series of specialty Arabica everyday beans suitable for beginners, covering representative beans from seven classic producing regions, including Ethiopia, Colombia, Brazil, and Yunnan, helping coffee enthusiasts build an understanding of the basic flavors of each region and find high-value options for daily drinking. [more…]

Regarding caffeine in tea, many plausible-sounding claims circulate: some believe black tea has far more caffeine than green tea, some think green tea contains almost no caffeine, and others are convinced that the deeper the fermentation, the more caffeine. Is any of this actually true? All tea leaves from the tea plant—unless decaffeinated—inherently contain caffeine, and the level depends more on plucking tenderness, tea cultivar, cultivation methods, and climate conditions than on the degree of fermentation or oxidation. Buds and newly opened leaves have the highest caffeine concentrations, African Assamica tea plants are generally higher than Chinese varieties, and older leaves plucked in autumn tend to be lower. In addition, theanine, unique to tea, works synergistically with caffeine to deliver a calm yet alert lift—quite different from the jolt of coffee. This article breaks down these factors one by one and explains why Front Street Coffee labels the caffeine content of the teas it sells, helping you make a more suitable choice based on your own tolerance. [more…]

In the world of coffee, Arabica and Robusta are the two most frequently mentioned varieties. Arabica dominates the specialty market with its delicate flavors, while Robusta, with its formidable vitality and rich, full-bodied taste, plays an irreplaceable role in commercial blends and instant coffee. Why is it called Congensis? What are its cultivation advantages and flavor drawbacks? And how does Front Street Coffee incorporate it into classic blends? This article will guide you through a systematic understanding of Robusta's origins, characteristics, pros and cons, and explain why commercial brands like Starbucks favor it. [more…]

In tea leaf harvesting, besides the common one bud with two leaves and one bud with three leaves, there is also a classification based on the degree of opening of the new shoot's terminal bud: unopened, small open-face, medium open-face, and large open-face. The purpose of open-face picking is to enrich the tea's internal substances, thereby improving the quality of the finished tea. Different degrees of opening correspond to different levels of maturity, affecting the difficulty of leaf processing and the flavor of the finished tea: older leaves are easier to process, with a mellow taste and high aroma; tender leaves are harder to process, prone to a bitter aftertaste but with a strong flavor and good durability for multiple infusions. Oolong teas such as Phoenix Dan Cong and Tieguanyin have their own preferences for open-face standards, and high-quality black tea raw materials often use open-face leaves as well. In this article, Front Street Coffee combines changes in tea chemical composition to clarify for you the differences in picking standards between Tieguanyin and Phoenix Dan Cong. [more…]

When many people first learn about coffee, they often hear variety names like Arabica and Robusta, yet they may not clearly understand the essential differences between them. From the perspective of Front Street Coffee, this article systematically sorts out the origin and classification of Robusta coffee, its main producing regions, flavor characteristics, cultivation advantages and disadvantages, and explains why it has become an important raw material for instant coffee and commercial blends. At the same time, it compares Arabica varieties to help coffee enthusiasts understand the key differences between the two major varieties in terms of altitude requirements, disease resistance, caffeine content, and cup performance, so as to gain a more comprehensive understanding of every cup of coffee they drink daily. [more…]

When buying coffee grounds or instant coffee, the word "Arabica" often appears on the packaging, and many friends who are new to coffee are curious about what it actually means and what kind of quality 100% pure Arabica represents. From the perspective of Front Street, this article sorts out the botanical classification, growing conditions, and flavor characteristics of Arabica coffee beans, compares the differences with Robusta, explains why it has become the mainstream of the specialty coffee market, and introduces the multiple classic origins covered by Front Street's everyday beans series, helping beginners build an understanding of the basic flavors of major origins and understand the importance of coffee bean freshness to extraction. [more…]