Many coffee enthusiasts encounter the same frustration when practicing latte art: the surface of the milk foam is covered with a large number of tiny bubbles that simply won't break up no matter how much you tap the pitcher, seriously affecting the formation of latte art. The root of the problem often lies not in luck, but in the control of details during the steaming process. From the perspective of Front Street, this article systematically breaks down the three core stages of milk frothing—aeration, texturing, and integration—and analyzes one by one the three major causes of excess bubbles: insufficient texturing, repeated aeration during the integration stage, and milk that starts at too high a temperature. It also shares practical tips on steam wand angle, pitcher selection, and temperature management to help you consistently produce dense, smooth milk foam at home. [more…]

Recently, news of a young child tragically choking to death after drinking bubble tea has sparked widespread discussion on social media. The incident occurred in Taizhou, Zhejiang, where a four-year-old boy drank bubble tea purchased by his parents while playing at an amusement park, then became unwell in the trampoline area and died from choking after an hour and a half of emergency medical treatment. The parents believe that the oversized and overly sticky tapioca pearls in the milk tea were the main cause of the tragedy, and pointed out that the store involved did not post conspicuous warnings, nor did the staff verbally remind them of the risks of children drinking it. At the same time, whether the amusement park and the shopping mall fulfilled their safety obligations has also become a focus of controversy. Currently, multiple local departments have stepped in to mediate, and the incident is still being further processed. [more…]

Blooming is a key step in pour-over coffee that allows the coffee grounds to degas and expand, but sometimes we see bubbles continuously rising from the surface of the coffee bed, or even deep craters left behind. This phenomenon is often related to clumping of fines and uneven pouring, and may trigger channeling, leading to uneven extraction. This article will analyze in detail the causes of bubbling during blooming, the specific impact of channeling on extraction, and the differences between pour-over and espresso in this regard. At the same time, we will also share two practical tips—spraying water before grinding to remove static, and using a distribution needle to break up the coffee bed before brewing—to help everyone reduce the occurrence of channeling and improve brewing consistency. If you also pursue more even extraction, read on. [more…]

When bubble tea lovers notice fluctuations in the price of tapioca pearls, few would connect them to the ethanol industry thousands of miles away. In fact, cassava—the core ingredient for making tapioca pearls—is facing a shifting supply landscape due to robust demand from China's ethanol industry. Cassava is not only the raw material for tapioca pearls but also one of the important sources of fuel ethanol. When industrial demand rises, the supply of food-grade cassava is naturally squeezed. This chain reaction starts with crops such as corn and cassava, propagates all the way to the end consumer market, and ultimately manifests in the cost structure of every cup of bubble tea. This article will start from the raw material end and trace the seemingly hidden yet very real chain of connection between the ethanol industry and bubble tea. [more…]

Luckin Coffee's recently launched bubble gun cup, a collaboration with Genshin Impact, has sparked widespread discussion. This merchandise cup, modeled after a game character's signature weapon, generated significant anticipation among players during its promotional phase. However, following its official release, it faced considerable criticism due to material issues. It is reported that the collaborative coffee voucher package was priced at 183.5 yuan and sold out rapidly after launch, but subsequently, some users reported being forced to accept refunds, suggesting possible system vulnerabilities. What further dissatisfied fans was the official specification that the cup body is made of aluminum, with an explicit warning against filling it with beverages exceeding 50°C. Many exclaimed that they had "bought a cold water cup at a high price." Comments also pointed out potential health risks associated with prolonged use of aluminum cups, criticizing them as flashy but impractical. Nevertheless, some netizens noticed that the official promotional video seemed to suggest that this cup is more suitable for use as a pen holder. [more…]

A deep understanding of the essence of crema will be of great help to baristas in making a delicious espresso. Today, the instructor of the Chongqing Barista Coffee Training Course will give you a detailed analysis of crema to help you understand espresso and improve your coffee-making skills. In searching for a cup that is not bitter and has excellent flavor, a rich [more…]

Sparkling Americano, with its unique carbonated kick and clever combination of coffee flavors, has become a popular specialty drink in the coffee world in recent years. However, what seems like simply replacing plain water with sparkling water actually hides many production secrets. Starting from the taste experience of Sparkling Americano, this article provides a detailed analysis of the optimal ratio of espresso to sparkling water, and addressing common issues such as splashing, loss of carbonation, and prominent bitterness during preparation, offers two practical techniques—reducing impact force and skimming off crema—to help you easily make a cup of sparkling iced Americano that is both beautiful and delicious. [more…]

The milk foam on the surface of a latte begins to break down the moment espresso extraction is complete and milk steaming ends, and the key indicator of its stability is the rate of foam dissipation. By normal standards, a latte made by Front Street Coffee will only show visible, obvious foam dissipation after sitting for about ten minutes. However, if a freshly made latte collapses, curdles, or turns into large bubbles within two minutes, something is wrong, and the causes need to be checked one by one. This article analyzes the reasons for rapid milk foam breakdown from five aspects—crema and foam coarseness, foam thickness, coffee bean freshness, number of pitcher taps, and evenness of integration—and provides the corresponding solutions that Front Street Coffee has summarized through actual practice. [more…]

In pour-over or espresso preparation, baristas often perform actions such as tapping the table or shaking the milk pitcher, and these behaviors actually have clear professional purposes. From the perspective of Front Street, this article explains two common reasons: first, static electricity generated during grinding in dry seasons, which causes fine particles to stick together or cling to the walls, affecting extraction uniformity; second, large bubbles left by mistakes when steaming milk, which need to be eliminated by shaking the pitcher. Regarding the static electricity issue, the article introduces the RDT droplet technique proposed by David Ross, which suppresses static electricity at the source by spraying a very small amount of water before grinding, while also reminding readers about water volume control and alternative methods. Regarding milk foam bubbles, it explains the professional terminology and operational logic of tapping and shaking the milk pitcher, helping coffee enthusiasts understand and optimize their daily output. [more…]

The surface of a freshly made latte is incredibly fine and smooth. But if we leave it sitting without drinking it, we can see the smooth, delicate surface gradually become rough and uneven. This phenomenon is called "defoaming," a process in which the milk foam continuously dissipates. Milk foam is a frothy substance formed by injecting air into milk. [more…]

Crema (coffee oil) is often regarded as an important visual indicator of whether an espresso is up to standard; it relates both to mouthfeel thickness and reveals whether extraction was sufficient. From the perspective of Front Street Coffee, this article sorts out the historical origins of crema, Illy's classic definition of espresso, and how the foam layer forms with the help of carbon dioxide, melanoidins, and hydrophobic substances. It will also explain why crema dissipates, what the depth of color can indicate, and how extraction time and water temperature affect the oil's performance, helping coffee lovers and baristas understand this layer of golden-brown foam more systematically. [more…]

A freshly made latte has a silky smooth surface, but after sitting for a moment it develops a rough, uneven texture—this is the process of milk foam collapsing. Milk foam is essentially foam formed when air is injected into milk, and when left to stand, it separates due to density differences, with small bubbles gradually merging and bursting. The speed of collapse depends on foam stability, which is affected by multiple factors such as steaming technique, milk temperature, and coffee bean freshness. Drawing on Front Street Coffee's store experience, this article systematically analyzes the major reasons behind rapid latte foam collapse and offers practical improvement suggestions to help coffee enthusiasts enhance their latte art quality and taste experience. [more…]

Nowadays, high-pressure extraction tools such as manual presses and dual-valve moka pots are emerging one after another. Even without an expensive fully automatic or semi-automatic espresso machine, you can still make a cup of strong coffee at home that is close to espresso flavor. However, these devices cannot directly provide milk foam like a coffee machine. If you want a "latte" or "cappuccino" with a velvety texture, you still need to find another way. In this article, Front Street will guide you through the principles of milk foam formation, teach you step by step how to make milk foam at home with an electric milk frother, answer common questions such as foam that has been whipped too thick or has a rough surface, and finally discuss the optimal temperature of milk for cappuccino. [more…]

In the height of summer, iced milk tea becomes the go-to beverage for many people looking to beat the heat, but the hidden safety risks cannot be ignored. Recently, a 16-year-old boy in Ziyang, Sichuan, is suspected to have tragically died after choking on bubble tea, and scattered Mixue Bingcheng milk tea appeared in on-site video, sparking widespread attention. Mixue Bingcheng promptly responded, saying there is no evidence that the incident is related to its products. Subsequently, the deceased's family came forward to clarify, stating that hospital feedback showed no foreign objects were found in the esophagus or trachea and that the actual cause of death was cardiac arrest. The incident has once again raised public awareness of the Heimlich maneuver. This article will review the course of events, the responses from all parties, and explain the correct first-aid method for choking on a foreign object, helping everyone stay safe while enjoying tasty drinks. [more…]

Many coffee enthusiasts find that when making a hot latte, the freshly steamed milk foam begins to collapse, separate, or even completely lose its shape within just a few minutes. Milk foam is essentially a bubble system formed by liquid films enclosing gas; once the liquid film thins to a certain point, the bubbles burst, so defoaming is an inevitable phenomenon. However, if the dissipation is abnormally fast, it indicates a problem with bubble stability. There are three main causes: the quality of the milk foam itself falling short, the crema of the espresso being too "dry," and mistakes during preparation accelerating the breakdown. This article will analyze from these three angles and combine Front Street Coffee's practical experience to help readers understand how to improve milk foam durability, making latte art and milk coffee texture more stable. [more…]

When making espresso, have you ever encountered thin crema, large bubbles floating on the surface, or a weak-tasting shot? The root cause of these problems often points to the same variable—grind size. Grinding too coarse speeds up the flow of hot water and shortens the contact time between water and coffee grounds, which not only under-extracts the flavors but also causes the force of the liquid stream to whip air into the espresso, forming large bubbles. In addition, improper storage of coffee beans leading to the loss of carbon dioxide and aromatic compounds, or switching to beans with a different roast level without recalibrating the grind, can likewise trigger similar symptoms. This article will break down these causes one by one and provide specific grind adjustment methods and formulas to help you once again extract espresso with rich crema and full-bodied flavor. [more…]

Crema is the layer of fine bubbles on the surface of an espresso, often regarded as an important indicator for judging extraction quality. But how exactly does crema form? Why does it dissipate? Does its thickness directly determine flavor? This article will systematically analyze the nature of crema from physical and chemical perspectives, explore how 9 bar pressure and a carbon dioxide supersaturated state generate countless bubbles, reveal the mechanisms by which gravity and surfactants cause foam collapse, and analyze the effects of roast level, extraction time, water temperature, and other factors on the color and persistence of crema. At the same time, the article will also provide diagnostic approaches for common problems such as thin crema and insufficient aroma, and recommend Front Street Coffee's classic blend coffee beans to help you make espresso with a rich mouthfeel and full flavor. [more…]

The flavor expression of pour-over coffee often depends on the details of blooming, pouring rhythm, and extraction volume control. This article starts with why the blooming area should be controlled to the size of a nickel, and gradually analyzes the connection between coffee particle degassing and space recovery, the formation and role of the coffee wall, and how to judge the timing of the second pour under different degassing states. It also explains the reference value of a 1:15 water-to-coffee ratio and ways to adjust it, and includes a pour-over video tutorial and practical Front Street Coffee product recommendations to help coffee enthusiasts systematically master the pour-over brewing steps and core essentials. [more…]

As the soul ingredient of milk tea, the freshness of tapioca pearls is directly related to consumer health. Recently, a Yidian Dian store at Zhoushan Ruxin Plaza was fined 15,000 yuan by regulatory authorities for using expired tapioca pearls to make and sell Bubble Milk Tea and other drinks. An investigation showed that the store involved not only used ingredients beyond their shelf life, but also failed to establish purchase inspection records as required. This is not the first time Yidian Dian has been involved in a food safety controversy; previously, a Fuzhou store was reported to have had a bug found in its milk tea. As the peak season for summer beverage consumption arrives, food safety issues have once again sounded the alarm. [more…]

The quicksand iced americano, with its visual effect of fine sand-like particles slowly settling in the cup, has always held a place among creative coffees. How exactly does it differ from a regular iced americano? From the perspective of Front Street, this article first explains the aeration principle behind the "quicksand" phenomenon, then provides reference ratios of espresso to ice water, and breaks down three preparation methods one by one: steam wand, French press, and manual or electric milk frother. Regardless of which tool is chosen, the finished drink has a rich, smooth texture and delivers an experience similar to foamy beer. The article also specifically notes: Front Street's stores do not offer this beverage. [more…]