Dirty coffee has become a staple in specialty cafes thanks to its high aesthetic appeal and unique taste, yet there has always been debate over whether an ice-cold cup is essential during preparation. Through side-by-side testing of glass cups at room temperature, refrigerated, and frozen, Front Street found that milk quality is the key to layering, while cup temperature mainly affects the chilled mouthfeel and the preservation of crema. The article also traces the practice of Dirty's originator, Katsuyuki Tanaka, who did not pre-chill his cup. If you're after photogenic presentation and a layered experience, Front Street recommends chilling the cup together with the milk and paying attention to the optimal tasting window. [more…]

Dirty has always been a popular product in coffee shops thanks to its high aesthetic appeal and the unique experience of hot and cold colliding. When making a Dirty, using a chilled glass can extend the layering effect between the espresso and the milk, but should you use a refrigerated glass or a frozen glass? Through comparative experiments, Front Street Coffee found that although a frozen glass can widen the initial temperature difference, it also accelerates the dissipation of the layers, and the milk's mouthfeel and aroma are slightly compromised. The rise in popularity of -86°C Dirty has brought frozen glasses into the spotlight once again. This article explains in detail the differences between refrigerated and frozen chilled glasses, the points to note when making a Dirty with a frozen glass, and why purified milk is the best partner for a frozen glass, helping you fully understand the intricacies behind this dirty coffee. [more…]

Since the ingredients used to make a Dirty and an iced latte are exactly the same—both are iced milk plus espresso—and they look much the same, both featuring a layered structure created by the milk and the espresso, Front Street Coffee often gets asked by customers drinking iced lattes: "Both are iced milk plus espresso, so what's the difference between a Dirty and [more…]

Espresso extraction involves numerous variables, and portafilter temperature is often overlooked. Front Street Coffee designed a comparative experiment to address the question of "whether the hot or cold brew head affects tamping force": keeping dose and yield fixed while only changing the portafilter temperature, recording time, concentration, flavor, and milk-coffee performance. The experiment used Front Street Sunflower Warm Sun Blend, and the results showed that although temperature did not significantly change the extraction yield, it clearly steered the flavor direction—a preheated portafilter made the full-bodied feel and winey notes more prominent, while a chilled portafilter amplified the fruity acidity and light texture. This article will present the complete experimental data and tasting conclusions, and answer whether tamping force needs to be adjusted with temperature, as well as how to decide on a portafilter preheating strategy based on the coffee bean roast level. [more…]

Many people find that their milk foam never turns out well when learning latte art. In fact, the quality of the milk and the way it is steamed both directly affect the fineness and staying power of the foam. This article starts with the types of milk, analyzing the differences between shelf-stable milk and chilled milk, and between whole milk and skim milk. It then uses Front Street Coffee's recommended Vitasoy whole milk fresh milk to explain in detail the temperature control, technique, and the ratio of milk to foam when steaming milk with a steam wand. It also shares methods such as tapping out bubbles and controlling the heating temperature to make the foam more stable and long-lasting, helping coffee lovers achieve better results when pouring latte art and making lattes and cappuccinos. [more…]

As a classic among espresso milk coffees, the Flat White is known for its light, silky microfoam and its full-bodied mouthfeel that sits level with the rim of the cup. Yet many coffee lovers have noticed that iced Flat Whites are extremely rare on the market. This is no coincidence—the traditional Flat White was designed from the outset to deliver a rich, full-bodied hot drink experience. Once ice is added, not only do the aroma and body suffer greatly, but concentration must also be sacrificed to cool it down, and even the signature light microfoam disappears entirely. Starting from the origins of the Flat White, a comparison with the cappuccino, and the meaning of "Flat White," this article will take a deep dive into why the iced Flat White struggles to gain a foothold, and how it differs fundamentally from the iced latte. [more…]

Dirty coffee and iced latte look quite similar in appearance, both presenting a layered effect of espresso over milk, but they are actually different drinks. This article starts with production details such as cup size ratio, whether ice is added, cup treatment, and layering requirements, systematically sorting out the differences between Dirty and iced latte, and explaining in detail the correct way to drink each. The article also combines the flavor characteristics of coffee beans such as Front Street classic blend, specialty blend, and dark cocoa base blend to explain how to choose beans to achieve the ideal layering effect and taste experience. [more…]

When beginners practice latte art, milk foam is often difficult to froth or dissipates quickly. In fact, the choice of milk and the frothing technique both directly affect foam quality. Front Street Coffee, drawing on practical experience, has sorted out the differences between shelf-stable and chilled milk, and between whole and skim milk, and explains in detail the temperature control, operational details, and common issues of steaming milk foam. The article also analyzes how the ratio of milk to foam, personal skill, and standing time affect foam durability, helping coffee enthusiasts systematically master the key points for producing fine, dense milk foam. [more…]

Every spring and summer, iced coffee becomes many people's go-to daily choice, and "exactly how much ice to add" is always the trickiest part of home brewing. Ice in coffee isn't just a cooling tool—it also affects aroma retention and how long the chill lasts. This article covers three main categories—espresso, pour-over, and cold brew and ice drip—and, combined with the characteristics of coffee beans at different roast levels, provides specific ice ratios and practical tips. It also explains how the texture, size, and freezing method of ice affect the final taste, helping you make a cup of iced coffee at home with just the right strength, flavor, and chill. [more…]

As temperatures climb, iced coffee becomes a daily choice for many, but the key to a delicious cup of iced coffee lies in precisely controlling the amount of ice used. Ice in coffee not only handles the cooling task, but also locks in aroma and slows the rise in temperature, making the refreshing taste last longer. However, different extraction methods and coffee beans of different roast levels have vastly different ice needs. This article starts from the role and quality requirements of ice, combines the specific scenarios of espresso, pour-over coffee, and cold brew ice drip, and analyzes in detail the logic for adjusting ice ratios. Using beans such as Front Street Classic Blend, Grana Geisha SOE, and Fruit Ding Ding as examples, it provides actionable home ice solutions to help you easily make a cup of iced coffee with just the right strength, flavor, and chill. [more…]

For more specialty coffee knowledge, please follow our WeChat official account: Front Street Coffee. At Front Street Coffee, there are two hidden menus for espresso coffee: one is the Flat White, and the other is [more…]

In the early morning, a can of black coffee is enough to awaken the sleeping senses. Black coffee adds no embellishment whatsoever, fully releasing the raw, rugged character of the coffee beans, with bitterness, acidity, aroma, and body interweaving into a distinct flavor profile. However, this taste of bitterness, acidity, and astringency coexisting is not something everyone can easily accept. Black coffee products on the market vary widely in style: some lean bitter, some are mildly bitter and acidic, some have pronounced acidity and bitterness, and there are also charcoal-roasted, blended, and various flavored coffees, each with different levels of sweetness and creaminess. This article sorts through these common categories and the taste characteristics of representative products one by one, while also explaining the natural advantages of black coffee—low sugar and low calories—to help coffee lovers find the one that suits them among the many choices. [more…]

In Ginza, Tokyo, there is a long-established high-end coffee shop founded in 1948—Café de L'Ambre, famous for its founder Ichiro Sekiguchi's ultimate pursuit of coffee quality. But compared to the shop itself, its original drink "Amber Queen" actually enjoys greater fame. This coffee has sweetened cooled black coffee on the bottom layer, with unsweetened condensed milk floating on top; one sip lets you experience the dual flavor of coffee and milky aroma at the same time, and the visual effect is also extremely soothing. Many enthusiasts try to recreate it at home, but often encounter the problem of the condensed milk sinking and being unable to form layers. This article will share the complete method for making Amber Queen, from explaining the principles to the brewing steps, to help everyone make a cup of this classic Japanese-style coffee drink with distinct layers. [more…]

The Dirty Coffee and the Flat White are two rather popular off-menu espresso drinks at Front Street Coffee. Although both are combinations of espresso and milk, they take completely different routes in terms of temperature, milk volume, milk foam thickness, cup type, and even the way they are enjoyed. Starting from the characteristics and differences of each, this article will break down the causes of the Dirty's layered effect and the key points of making it, explain the recipe approach behind the Flat White, and also touch on how to choose espresso beans with good value for money. Friends who love milk coffee might as well follow Front Street's steps and give it a try at home. [more…]

Dirty coffee has continued to rise in popularity in the coffee world in recent years thanks to its distinctive layered visual effect and rich flavor. Its preparation method is actually not complicated: pour chilled milk into an iced cup, then gently pour in espresso, using differences in density and temperature to form natural layers. So why has this drink maintained such high popularity? How exactly is it different from iced latte? And what does the word Dirty mean? This article will take you through the origins of dirty coffee and "dirty culture," clarify the core differences between Dirty and iced latte in ingredients, ratios, and taste, and share the key preparation points recommended by Front Street Coffee, so you can easily recreate a cup of clearly layered dirty coffee at home. [more…]

Want to make a beautifully layered, richly flavored Dirty coffee, but always end up with the embarrassing situation where the espresso shoots straight into the milk and turns into an iced latte? In fact, the key factors affecting the layering effect are not complicated, mainly including the distance between the espresso outlet and the milk surface, the temperature and concentration of the milk itself, and the extraction quality of the espresso. This article will analyze the common causes of layering failure one by one from these three perspectives, and give specific and feasible adjustment methods, including various operational solutions for shortening the distance, suggestions for using iced milk and a chilled cup, and how to judge whether the espresso concentration meets the standard through extraction time and grind size. At the same time, it will also recommend the types of coffee beans suitable for making Dirty and the specific flavor performance of Front Street Coffee's classic Italian blend, helping coffee lovers consistently produce a cup of Dirty with clear layers and harmonious taste. [more…]

Many people struggle to froth milk properly when they first start learning latte art. In fact, the quality of the milk also affects how easy it is to froth. Front Street Coffee would like to introduce a few types of milk that are easy to froth! In the eyes of baristas, milk is divided into ambient milk and chilled milk, whole milk and skim milk. When making coffee la— [more…]

Following yesterday's iced coffee tutorial, Front Street Coffee continues today with a refreshing summer special for coffee lovers—a guide to making iced lattes, plus a complete tutorial on the recently surging hit, Dirty coffee. With illustrations and text, the article walks through both drinks step by step, covering key parameters such as cup capacity selection, the ratio of ice to milk, coffee grounds dosage, and espresso yield, with special emphasis on ice-cup pre-chilling and hot-cold layering techniques for Dirty. Whether you want to easily recreate an iced latte at home or take on the richly layered Dirty coffee, you'll find practical guidance in this clear, step-by-step guide. [more…]

It must be said that the ways to play with espresso are truly endlessly varied—just the combination of espresso and milk alone can create a great many coffee drinks. Dirty coffee is a very popular type of espresso drink born from the collision of espresso and milk. If you know a little about espresso-related knowledge, it is not hard to find that Di [more…]

In recent years, ice bock milk coffee has set off a craze in the coffee world, with many cafés offering it as a signature product, and the refrigerated refined milk launched by Biro further fueled this trend. But even before that, some coffee shops were already using homemade ice bock milk to make drinks. So what exactly is ice bock? How does it differ in flavor from an ordinary latte? This article will start with the origin and principles of ice bock, teach you step by step how to make ice bock milk at home, and share Front Street Coffee's review of the flavor characteristics of ice bock milk, as well as its excellent performance when paired with espresso to make a Dirty. [more…]