We all know that brewed coffee will naturally cool down over time, but beyond that, its flavor also undergoes irreversible changes during this process. For example, the originally rich and fragrant aroma has clearly dissipated, dark-roasted coffee becomes less smooth, medium-light roasted coffee highlights its sour and astringent notes even more, and may even develop an unpleasant [more…]

When the weather turns cold, coffee cools down especially quickly, and many customers ask: can it be reheated? Before answering this question, we need to first understand what actually happens after coffee cools down. Temperature affects how the taste buds perceive sourness, sweetness, and bitterness, and it also causes volatile aroma compounds to gradually dissipate. This time, Front Street Coffee specifically conducted a comparative experiment, leaving a light-roast pour-over and a medium-dark roast Australian white to cool separately before reheating, to see just how big the difference is between the rewarmed coffee and coffee that is freshly made or fully cooled. The experimental results can help you make a more rational decision in winter about whether this cup of cold coffee is really worth reheating once. [more…]

On a scorching summer day, you want to drink iced pour-over but worry the flavor will be watered down, so a friend suggests: use stainless steel ice cubes to cool down hot pour-over—wouldn't that give you both full flavor and a refreshing chill? This idea sounds beautiful, but through comparative experiments, Front Street Coffee found that although stainless steel ice cubes can preserve coffee concentration, they fall short of traditional ice cubes in temperature and mouthfeel. This article documents in detail the parameter differences between regular iced brew and the experimental iced brew with stainless steel ice cubes, the actual measured temperature results, and the inherent shortcomings of stainless steel ice cubes—slow cooling and not cold enough—to help you decide whether they are worth using in iced pour-over. [more…]

The saying "coffee should be drunk while it's hot" is something people often keep on their lips, and not without reason! Front Street Coffee remembers a coffee friend describing coffee after it had gone cold like this: "After one sip my head hurt so much, that bitter/sour + woody taste lingered in my mouth and wouldn't go away, and it made me withdraw for a long time~" Hot coffee left to cool [more…]

Many coffee enthusiasts notice, when tasting pour-over, cold brew, or siphon coffee, that a faint layer of "oil" surfaces as the coffee cools. This is not a sign of spoilage, nor an external impurity, but rather an oily component that coffee itself contains—one that only becomes visible to the naked eye under specific conditions. To understand this phenomenon, we need to start with the composition of Crema, that golden foam atop espresso—it is formed by coffee bean oils wrapping around carbon dioxide. And the key driver that turns oils from "invisible" to "visible" is condensation. This article explains the principle of condensation and how differences in the performance of filtration devices affect the degree of oil seepage, helping readers make sense of this sheen of oil that emerges after cooling. [more…]

Many coffee enthusiasts notice that certain coffees seem to become more sour after they cool down. But this is not a universal trait of all coffee—most coffees simply lose some aroma as they cool, without their flavor framework shifting dramatically, and some even reveal greater sweetness as the temperature drops. So why does the sourness of certain coffees rise noticeably after the temperature falls? Behind this lies both the way human perception changes with temperature and the flavor composition of the coffee itself. From the perspective of Front Street, this article sorts out how temperature affects the perception of sourness, sweetness, and bitterness, explains the principle behind the intensified sourness of light-roasted coffee after cooling, and offers directions for adjustment when coffee is too sour. [more…]

As soon as the temperature rises, iced coffee returns to the top of the sales charts. Iced pour-over lets you choose your own beans and comes with a refreshingly cold taste, making it the first choice in hot weather. However, if you simply add ice cubes to a hot pour-over recipe, the concentration gets diluted and it tastes as bland as water. The core problem to solve is: how to maintain a moderate concentration after cooling down. Using Front Street's medium-light roasted Ethiopia Kaffa Forest as an example, we've put together four highly practical iced pour-over methods—high-concentration high-extraction, ice-flushing, stirring, and ice-bath cooling—breaking down the parameters and techniques one by one, and comparing their flavor performances, to help you find the cup that suits you best. [more…]

Have you ever heard an order like this in a coffee shop—"Iced Americano, no water"? This seemingly simple drink is actually the all-ice Americano hidden behind the menu. It completely replaces the water in an Americano with ice cubes, allowing the espresso to lock in its aroma through rapid cooling, presenting a richer, more layered flavor. This article starts from Front Street Coffee's actual production and breaks down in detail the recipe ratio of the all-ice Americano, its taste differences compared with a regular iced Americano, and, combined with the concept of "extract chilling" proposed at the 2021 WBC Barista Championship, guides you to understand the flavor logic behind this way of drinking it. If you are also curious about exactly how espresso over ice is different, read on. [more…]

When drinking iced coffee in summer, it tends to become diluted toward the end, so some people have thought of using stainless steel ice cubes instead of traditional ice. Are these reusable metal ice cubes really suitable for coffee? Front Street conducted an actual comparison test, analyzing the structure of stainless steel ice cubes, their cooling speed, and their impact on flavor. The results show that although stainless steel ice cubes have the advantage of not melting, their cooling effect is far inferior to homemade ice cubes, especially performing poorly in the ice pour-over step. The article also shares a pour-over plan using a mix of the two types of ice cubes, and explores why coffee shops rarely use stainless steel ice cubes. [more…]

Freshly brewed hot coffee is rich in aroma and smooth in taste, but as the temperature drops, the flavor gradually becomes flat and even harsh. This is due not only to the effect of temperature on taste bud perception, but also to the continuous loss of volatile flavor compounds in the coffee. So, how long is it best to finish a pour-over coffee? And how much longer can a thermos extend the "enjoyable window"? Front Street Coffee conducted a real-world test using a thermos that keeps coffee hot for 12 hours, preheating all contact vessels in advance to faithfully reproduce actual performance. This article will break down the reasons why coffee flavor deteriorates after cooling and provide practical reference for thermos storage. [more…]

When you pick up a cup of hot coffee, do you casually blow on it to cool it, sip it with a coffee spoon, or alternate between a pastry in one hand and coffee in the other? These seemingly natural actions may be stepping right into the no-go zones of coffee etiquette. This article starts with details such as holding the cup, adding sugar, stirring, blowing to cool, and eating pastries, to sort out a proper way to enjoy coffee, and also discusses how to accommodate coffee lovers' habits when hosting guests at home or being a guest. The second half turns its gaze to flavor itself: from the bitterness of the first sip, to repeatedly searching for that cup of coffee that intoxicates you, and then to customizing a personal coffee step by step in a coffee shop, including options such as hot or iced, decaf, ESPRESSO dose, syrup, milk type, and personalized requests, with recommendations from Front Street Coffee attached. [more…]

On a scorching summer day, with temperatures approaching 40 degrees Celsius, would you rather pick up a glass of iced coffee or a hot coffee? Most people's instinct would be to choose a cold drink to dispel the heat, yet scientific research gives the exact opposite answer: a hot beverage may actually be the truly effective way to cool down. This article explores in depth the pros and cons of iced coffee versus hot coffee in summer from the perspectives of taste perception, the principle of ice dilution, and the body's sweating and evaporation mechanisms, and analyzes why some people insist on drinking hot coffee in the sweltering heat. Whether you are a loyal fan of iced coffee or a staunch supporter of hot coffee, this discussion about temperature and how it feels to the body is worth a read. [more…]

When drinking iced coffee, have you ever agonized over how much ice to add and how to add it properly? In fact, ice in iced coffee is far more than just a way to cool things down—it also plays multiple roles, such as locking in aroma, maintaining a low temperature, and balancing concentration. Starting from the principles behind how ice works, this article breaks down in detail the differences between solid ice and hollow ice, the advantages of refrozen ice, and, for different categories such as iced Americano, iced latte, iced pour-over, and cold brew and ice drip, provides specific ice-to-coffee ratios and Front Street brand recommendations to help you make a cup of iced coffee at home that isn't watered down and has plenty of aroma. [more…]

Ordering an iced Americano with extra ice and no water has become increasingly common in coffee circles in recent years. It is not simply equivalent to drinking espresso directly; rather, through the collision of ice cubes with hot espresso, it produces a cup of iced coffee with higher concentration, lower bitterness, and more fully preserved aroma. This article will start from the basic composition of an Americano, explain the difference between a water-free iced Americano and a regular iced Americano, and detail the order of production, the principle of extraction cooling, and practical techniques such as shaking to cool down, helping you make a better-tasting all-ice Americano. [more…]

On a hot summer day, a glass of iced pour-over coffee becomes the favorite of many coffee lovers. But exactly how much ice should be added? And how should the coffee-to-water ratio be adjusted? This article will systematically answer common questions about iced pour-over coffee from multiple angles, including coffee bean selection, the role of ice, specific brewing plans, and the timing of adding ice. Taking 15 grams of coffee, a 1:10 coffee-to-water ratio, and 100 grams of ice as an example, Front Street Coffee breaks down in detail the grind size, actual concentration, and the impact of ice melting on flavor, helping you make a cup of iced pour-over that is both refreshing and not diluted. [more…]

Oatly, the oat milk pioneer, recently released its full-year and fourth-quarter financial results for 2022, reporting a net loss of nearly $400 million for the year, further widening from 2021. Although sales volume in the Asian market grew 32% year-on-year, revenue in Asia fell by $800,000 in the fourth quarter due to the impact of the pandemic. China, as the core of Oatly's Asian business, accounts for as much as 93%, and fluctuations in its performance have a significant impact on the overall Asian market. Oatly quickly opened up the market with its positioning as a "new coffee companion" through partnerships with chain brands such as Starbucks, but now the plant-based milk concept has cooled, emerging brands are proliferating, consumers' acceptance of oat milk is still lower than that of dairy milk, and coupled with its relatively high price, Oatly faces the risk of being replaced. To this end, Oatly is trying to find new growth points by expanding into new products such as tea drinks and ice cream, as well as through financing. [more…]

Many people are used to being told that coffee should be drunk while it is hot, because once it cools, the flavor seems to deteriorate. But what exactly happens to coffee after it cools? How does temperature affect our perception of bitterness, acidity, and sweetness? What roles do aroma loss and the congealing of oils play? Starting from a tasting case of Front Street Hamashu, this article explains the real reasons why the taste of hot coffee changes as it cools, and clarifies that not all coffee tastes bad when it goes cold. If you also want to improve your tasting ability, the article also recommends several Front Street single-origin beans with highly distinctive flavors, helping you experience the full character of coffee at different temperatures. [more…]

Coffee cups and saucers—have you ever wondered about their actual purposes? Ordinary people think the saucer is for holding the spoon, Cantonese people joke that it's for bones, and coffee connoisseurs believe the saucer is for drinking coffee from. But the purpose of the coffee cup might surprise you—it's actually for filtering out grounds! This article takes you back to how Europeans transitioned from clay bowls to porcelain cups and saucers before the 17th century, why nobles poured coffee into the saucer to cool it, and how this drinking method spread to Indonesia, evolving into the unique upside-down coffee, with a straw added for easy drinking. Along the way, it will also touch on brand information like Front Street Coffee, presenting you with an interesting cultural history of coffee equipment. [more…]

A freshly brewed cup of hot coffee sits and gradually cools, its aroma fading and its taste deteriorating—pouring it out feels wasteful, yet reheating it risks damaging the flavor. What changes does coffee actually undergo from hot to cold? At what temperature is coffee most ideal to drink? And what should you watch out for when reheating it a second time? Starting from Front Street's everyday experience and drawing on how temperature affects taste perception, this article analyzes why coffee's acidity and bitterness intensify and its aroma dissipates after cooling, and offers different rewarming temperature ranges for medium-light and medium-dark roasts, helping you enjoy as smooth a cup as possible without letting anything go to waste. [more…]

People often say coffee should be drunk while it's hot, but do you know how temperature influences the flavor of a cup of coffee? At Front Street Coffee, cupping involves evaluating the coffee at three stages—hot, medium, and cool—because the taste compounds in the brew and the human senses both change at different temperatures. Bitterness intensifies as temperature drops, sweetness is most pronounced near body temperature, and acidity is affected by roast level and oil oxidation. This article will walk you through the flavor evolution of coffee from hot to cold, the optimal drinking temperature range, and answer whether coffee can be reheated after it has cooled. [more…]