Monday, September 21 2026

Why does the espresso puck stick to the group head? How does the pressure relief function prevent the risk of machine explosion?

When making espresso, a puck sticking to the group head is an embarrassing situation many baristas dread most. Behind this is actually a close relationship with the espresso machine's pressure relief function—after extracting the coffee, the machine needs to release the residual pressure in the portafilter basket, otherwise removing the handle could cause the machine to explode. So why exactly does the puck get stuck? And how does the pressure relief valve work? Front Street Coffee will explain these issues clearly in one go, from principles to practical operation, helping you understand and avoid this kind of "work nightmare." [more…]

Some McDonald's locations have been reported to have steam explosion hazards in their coffee machines, leading to a suspension of related beverage supply in the US and Canada.

McDonald's recently suspended the use of certain coffee machines at some restaurants in the United States and Canada after its coffee machine supplier, Melitta, reported safety hazards with the equipment, leaving espresso-based drinks, hot chocolate, and other products unavailable. According to CBS News, Melitta found that a component of the coffee machines may be defective, potentially causing a steam explosion and damaging the equipment, and inspections and investigations could last three weeks. McDonald's has more than 14,000 restaurants across the United States and sells nearly 8 million cups of coffee every day. The incident has affected multiple cities, including Atlanta, Dallas, Pittsburgh, New York, and Tampa. The brand said it is assessing the scope of the impact and working closely with the supplier to restore supply as soon as possible. [more…]

When exactly should you turn off the heat when brewing coffee with a moka pot? Fast flow and whether to tamp the grounds—all explained clearly in one go

The moka pot, Italy's national-level home coffee brewing device, can extract a rich, espresso-like coffee liquid. However, in practice, many enthusiasts are confused about when to turn off the heat, the flow rate of the coffee liquid, and whether tamping is necessary. This article will start with selecting coffee beans suitable for the moka pot, explain in detail how to determine the dose, control the water volume, and provide grinding size reference standards, and then walk through the moka pot coffee-making process step by step, helping you avoid risks such as explosions and splattering, and easily brew a cup of mellow, rich moka pot coffee. [more…]

The Dilemma of Milk Tea Shops Under the Takeout Subsidy War: Jasmine Milk White Employees Face the Pressure of Order Explosions and Delivery Riders Chasing Orders

Recently, the food delivery competition between JD.com and Meituan has yet to subside, and Ele.me has now joined the fray with a large number of coupons and subsidies. While delivery users enjoy low-priced milk tea, staff at brands like Molly Tea are under unprecedented order pressure. Drinks that originally cost a dozen yuan per cup have seen their prices plummet to five or six yuan after platform subsidies, or even just a few cents, causing order volumes to instantly double or surge, with some stores handling as many as five or six hundred orders per day. Understaffing, material shortages, riders urging them on, and customer complaints have become the daily reality for these coffee and milk tea workers. This article will take you behind the scenes of this delivery subsidy frenzy to see the real working conditions and helplessness of frontline employees. [more…]

Moka Pot Operation Guide: Extraction Principles, Coffee-to-Water Ratio, Grind Setting, and Step-by-Step Illustrations

The moka pot is a common espresso device in Italian households, and thanks to its ease of operation, it has become an almost national-level product. However, in China, many enthusiasts still lack a systematic understanding of how to use it. This article will provide a complete introduction to the moka pot's structure and extraction principles, and explain step by step the key details of determining coffee dose, controlling water volume, choosing grind size, and heating operation. The article also specifically recommends Front Street Coffee's moka pot exclusive beans, and includes a grind setting reference, helping you easily brew an espresso-base coffee with excellent strength and flavor at home. [more…]

A Complete Analysis of Moka Pot Italian-Style Brewing Details: From Structural Principles to Anti-Seizing and Safe Operation

The moka pot is an extremely common classic coffee device in Italian households, with almost every home keeping one on hand. It relies on the steam pressure generated by heating the lower chamber to push hot water through the coffee grounds and into the upper chamber, thereby producing a cup of rich coffee with oils. However, in China, not many people truly understand its correct use. This article will begin with the moka pot's invention history, structural composition, and extraction principles, then explain in detail the key steps such as the water filling position, coffee distribution method, heating rhythm, and grind size. Combined with a brewing example using Front Street PWN Golden Mandheling, it will help readers avoid splashing, explosion hazards caused by improper operation, and problems such as the pot seizing shut and being impossible to open after use, so that the moka pot can produce consistent results. [more…]

How to Determine the Grind Size for a Moka Pot? A Full Analysis of Single-Valve vs. Double-Valve Pressure Differences, Pros and Cons

As a classic choice among home coffee equipment, the moka pot's single-valve and double-valve differences directly affect the resulting concentration and crema performance. This article starts with the structural principles, analyzes the extraction pressure differences between the two valve types, and outlines the pros and cons of the moka pot, the suitable coffee grind size range, and recommendations for coffee bean roast level. It also includes a complete operating procedure, covering dose control, heating techniques, and daily maintenance points. The article also introduces the recipe ideas and flavor characteristics of Front Street Coffee's two espresso blends, helping enthusiasts make clearer judgments when purchasing and practicing. [more…]

Ethiopian Sidamo Natural Huakui Coffee Bean Analysis: Can Medium-Roast Huakui Handle Moka Pot SOE?

Huakui coffee is a highly distinctive single-origin natural bean from Ethiopia, and with its explosive aroma and sweetness it once took first place in the natural category in the 2017 harvest season. It is produced in Hambela, in the Guji region, picked from all-red cherries, sun-dried on African raised beds, and fermented at low temperature for 21 days, so that when brewed its wine-like notes interweave with floral aromas. Front Street Coffee's natural Huakui G1 is freshly roasted and affordably priced, and its medium-roast version is just right for making SOE with a moka pot or an espresso machine. This article explains Huakui's background and flavor characteristics in detail, and demonstrates step by step the entire process of making a Huakui latte with a moka pot, from filling the basket and heating to steaming milk and pouring latte art, helping enthusiasts recreate a cup of high-sweetness espresso at home. [more…]

A Coffee Shop Owner's Fight for Justice: Bought a La Marzocco PB from an Acquaintance Only to Find It Was Grey-Market, and After the Boiler Burst, the Official Records Showed No Such Machine

A coffee shop operator in Guangxi recently publicly recounted his experience: he purchased a La Marzocco PB espresso machine from a well-acquainted "coffee champion," and after only one year of use, the boiler exploded. When he applied to La Marzocco China's official after-sales service, he was told that the machine had no record in the system and was a "grey import" sold through unofficial channels. The shop owner believes the other party deliberately concealed the sales channel, and has sent a lawyer's letter and reported the matter to the police. This dispute quickly fermented within the coffee community and also drew practitioners' attention to how to distinguish genuine La Marzocco espresso machines from grey imports. Front Street Coffee reminds all colleagues that when purchasing equipment, one must make sure to buy through officially authorized channels, and not risk a big loss for a small gain. [more…]

A Complete Guide to Brewing Coffee with a Moka Pot: Bean Selection, Grind Size, and Safe Operation Tips

If you want to enjoy rich coffee close to café flavor at home, a moka pot is an extremely cost-effective choice. But to brew coffee liquid with oils and a full-bodied mouthfeel, bean selection, grinding, and operating details are all indispensable. This article focuses on the types of coffee beans suitable for a moka pot, how to judge the grind size, and the standard usage process and safety precautions. It also combines Front Street Coffee's espresso blends and SOE series to give specific bean selection suggestions. Whether you are a beginner who has just gotten a moka pot or a player who wants to advance and explore single-origin flavors, you can find practical references here. [more…]

How to Choose the Coffee Grounds Setting for a Moka Pot? A Complete Guide to Grind Size Judgment and Safe Use

Using a moka pot looks simple, but the grind size for the coffee grounds gives many beginners a headache—too coarse and the flavor is weak, too fine and the coffee liquid struggles to flow out or even over-extracts. Grind size directly affects the extraction yield, working in tandem with contact time and flow rate. The moka pot is a pressure-driven device, operating at about 1.5 bar, with a grind size close to espresso but slightly coarser, and a particle diameter of about 0.3–0.55 mm. This article provides two methods: measuring with a particle size ruler and judging through dialing in, and offers adjustment suggestions based on Front Street Coffee's Classic Blend and Front Street Coffee's Strawberry Candy Espresso Blend. Finally, it reminds readers of the safety points for using the pressure relief valve, helping coffee lovers achieve consistent results. [more…]

Moka Pot Brewing Tutorial: A Complete Guide to Extraction Principles, Bean Selection Strategies, and Milk Coffee Preparation

Although the moka pot is simple in structure, it is often misunderstood as an outdated device. In fact, with just a few key points mastered, it can consistently extract espresso with crema. From the perspective of Front Street, this article analyzes the extraction principles of the moka pot and the reasons it fell out of favor historically, recommends suitable coffee bean recipes, and teaches you step by step how to make a milk coffee with latte art using a moka pot. At the same time, we will also sort out practical details such as water level control and flow rate judgment, helping you avoid the risks of over-extraction and the pot exploding, so that even a home moka pot can deliver professional-level flavor performance. [more…]

Moka Pot Coffee Grind Size | How Fine Should Coffee Be Ground for Moka Pot Brewing? How to Adjust Coffee Grind Size for a Bialetti Moka Pot?

Having grown accustomed to coffee made with commercial espresso machines outside, replicating the taste of a coffee shop at home is no simple matter. Due to a lack of funds and space, one has no choice but to use a moka pot to brew the rich, bold coffee they desire. However, even with the tool in hand, using a moka pot [more…]

Bialetti Moka Pot Coffee Grounds Grind Size Adjustment Tips and Complete Step-by-Step Guide

To replicate a café-level rich flavor at home with a moka pot, adjusting the coffee grind size is a key step. Starting from the origin story and extraction principles of the Bialetti moka pot, this article systematically explains the standard operating procedure for moka pots and, addressing the challenge of crema extraction, provides an in-depth analysis of the three major influencing factors: coffee bean freshness, roast level, and grind particle size. The article also offers specific recommendations for Front Street Coffee beans, as well as practical methods for judging whether the grind size is appropriate, helping you consistently produce a cup of moka pot coffee with intense aroma and a full-bodied taste while ensuring safety. [more…]

How to Use a Moka Pot Correctly | What Are the Working Principles and Structural Features of a Moka Pot? A Detailed Tutorial on Brewing Coffee with a Moka Pot

For more specialty coffee knowledge, please follow: Front Street Coffee (Frontsteet Coffee). As coffee culture gradually becomes more widespread in China, many newcomers who have just stepped into the coffee world are beginning to pick up various brewing tools and delve into extraction. Compared with expensive and cumbersome espresso machines, the moka pot is much simpler and more accessible. [more…]

How to Adjust the Coarseness of Coffee Grounds for a Moka Pot? An Analysis of Bialetti Moka Pot Grind Size and Methods for Enhancing Crema

Replicating the rich flavor of a café at home with a moka pot makes coffee grind size one of the key variables. This article begins with the birth of the moka pot and its brewing principles, then gradually explains the standard operating procedure, techniques for judging grind size, and three directions for improving crema performance—coffee bean freshness, roast level, and grind size. The article also compiles product information for Front Street Coffee's Classic Blend, Commercial Blend, and Queen's Farm Yellow Bourbon from Brazil, and reminds readers of the pressure relief valve and safety precautions, helping coffee lovers consistently brew a cup of moka coffee with a strong aroma and rich, full-bodied taste at home. [more…]

Moka Pot Features | What flavor and mouthfeel does the concentrated black coffee brewed with a moka pot have? What coffee beans are used for a moka pot? Is it safe to brew coffee with a moka pot?

The moka pot, this classic Italian coffee maker, is extremely popular in its home country—it's said that 8 out of every 10 households own this wonderful coffee-brewing device. However, in our country, the moka pot is relatively seldom used, which means many people have never had a thorough explanation of how to use it. Today, Front Street Cof [more…]

Moka Pot Coffee Grind Size | What are the pros and cons of brewing coffee with a Bialetti double-valve moka pot? Which coffee beans are suitable for moka pot brewing?

Believe that for Moka pot enthusiasts, the terms "dual-valve" and "single-valve" are certainly familiar. However, for beginners, to use a Moka pot to brew delicious coffee, it is still necessary to learn a bit first. Which is better, a single-valve or dual-valve Moka pot? Nowadays on shopping platforms, there are countless choices when you want to buy a Moka pot. [more…]

An In-Depth Analysis of the Moka Pot Extraction Principle: A Complete Guide to the Pressure Mechanism, Everyday Bean Pairings, and Operational Details

With its simple operation and rich output, the moka pot has become the top choice for many coffee enthusiasts just getting started. This article starts from the moka pot's pressure-extraction principle, compares it with espresso machines, explains in detail the suitable dark-roast espresso blend bean choices, and fully presents five everyday beans recommended by Front Street Coffee, along with moka pot operating steps and precautions, to help you consistently extract rich coffee with crema aromatics. [more…]