The Allongé shot originated about 12 to 14 years ago in Montreal, where cafes pulled a large, fast-flowing espresso that resulted in a five-ounce or 150 ml beverage. Scott Rao's cafe became the first in Montreal to set up a dedicated second grinder ground specifically coarser for Allongé shots. Using traditional E61 espresso machines, they managed to achieve incredibly high extraction rates of 22% to 23%. When pulled successfully, these shots tasted like "fruit bombs" and shocked coffee industry professionals with how enjoyable a five-to-six-ounce espresso could be.
When first introducing the Allongé shot to coffee professionals—such as the staff at Square Mile in London—their initial reaction to seeing it brew is that it looks like a "gusher". In traditional espresso making, water rushing through the coffee puck that quickly is strongly associated with severe channeling or a poorly dialed-in grind. However, tasting the shot proves that it tastes far better than it looks because it successfully achieves high extraction through a high flow rate while maintaining the correct pressure.
Light roasts do not give up their coffee material easily compared to darker roasts. To extract them successfully, you either need a long contact time with the water (such as blooming shots or longer pre-infusions) or a faster water flow rate where more water passes through the coffee puck to pull out the material.
Traditional Italian espresso profiles feature a very slow flow rate, typically ranging from 0.5 ml per second to about 1.5 or 2 ml per second to create a thick beverage. Standard light roast espresso extractions generally target 1.5 to 3 ml per second for a traditional 40 to 50 ml yield. In contrast, the Allongé operates at a much faster flow rate to push a massive amount of water through the coffee puck, filling a much larger cup.
To make a proper Allongé, you must have an espresso machine capable of measuring the actual pressure at the coffee puck rather than just the pressure at the pump. Most traditional machines only display pump pressure, but an Allongé requires true espresso-level pressure right at the puck during a high-flow extraction. Machines that feature advanced flow profiling and give real-time puck pressure readings are necessary to monitor and achieve this profile successfully.
While a blooming espresso relies on a long 30-second pause after pre-infusion to maximize contact time, an Allongé takes the opposite approach by using no pause time. Instead, the coffee is ground coarsely to allow a very fast water flow rate—about twice as much water flow as a traditional light-roast espresso—resulting in a much larger volume in the cup.
To recreate an Allongé on a traditional espresso machine without advanced flow-profiling graphics, you should aim for a 5:1 or 6:1 brew ratio within a 30 to 60-second window. For example, if you weigh out an 18-gram dose of coffee beans, you should multiply that weight by five and aim to hit that total liquid yield in your cup within 30 seconds.
A beginner should start with a standard dose, such as 18 grams of coffee in an 18-gram basket, and set a fairly coarse grind. The target recipe is to achieve roughly a 4:1 brew ratio within 30 seconds. Because most people approach this from a traditional espresso background, they usually grind too fine at first, causing the machine to max out at 12 to 13 bar of pressure without hitting the target weight. The easiest fix is to progressively coarsen the grind until the peak brewing pressure drops into the ideal range of 8 to 9 bar.
The primary challenge on a traditional espresso machine is the lack of real-time pressure feedback. If the shot drops down to three or four bar of pressure instead of maintaining high pressure, it will taste terrible. Because it is difficult to maintain consistency and prevent channeling at such high flow rates, having a machine that provides visual data graphs is highly beneficial for successfully repeating this specific technique.
Because the water courses through the coffee puck so rapidly, it reaches equilibrium quickly and stays incredibly stable at the target temperature (e.g., 92°C) throughout the entire extraction. This is unlike traditional espresso, where the room-temperature coffee grinds initially cool down the incoming water, causing a massive temperature dip in the slurry during the first 5 to 10 seconds.
Due to the high dilution and rapid extraction, the drink mimics the concentration range of filter coffee but retains the rich oils, crema, and mouthfeel unique to espresso. This technique is highly effective at muting any unpleasant qualities of light roasts—such as baked or underdeveloped flavors—while pulling forward distinct fruit, floral, and sweet toffee notes, all while heavily taming sharp acidity.
The high pressure applied during the extraction environment forces non-polar oils out of the coffee bed, which is something standard filter brewing at atmospheric pressure cannot achieve. Because the flavors are dissolved in these oils rather than just water, they stick to the palate and create a prolonged, intense aftertaste.
Traditional machines measure temperature directly inside the steam or water boiler, whereas the Decent Espresso machine measures it just two millimeters above the coffee puck. Water leaving a traditional boiler loses 6 to 8 degrees Celsius as it travels through heavy metal components like an E61 group head, making its external measurement misleading compared to the actual extraction environment.
The machine's software automatically alters the incoming water temperature multiple times per second to hit a consistent target "slurry temperature". For example, when aiming for a 92°C extraction, the machine delivers water at 94°C initially to compensate for the cold coffee grounds, then automatically cools the incoming water as the puck warms up.
John explains that he relies on grind size as his coarse adjustment mechanism and treats the dose as his fine-tuning tool. Tiny adjustments to the dose—even a fraction of a gram—can result in major variations in flow rate and pressure.
An Allongé serves as an ideal substitute for a long black, but it skips the step of manually adding bypass water. Running all the water directly through a light or ultra-light roast maximizes extraction efficiency and complexity. While it can handle a splash of milk, heavy milk will easily drown out its delicate, filter-like concentration.
Pour-over brewing is highly susceptible to human error and channeling. Baristas often prioritize the "theater" of brewing, using variable pouring heights and random agitation patterns that leave some areas of the coffee bed overly extracted and others dry.
Acidity can be managed by adjusting the extraction pressure or modifying the mineral content of the water. Adding a couple of drops of a carbonate buffer solution to an over-acidic, low-pressure shot can mute the sharp acidity and balance the flavor.
An Allongé shot successfully marries the flavor characteristics of two distinct brewing styles. It manages to extract the complex, vibrant flavors typically associated with a high-quality filter coffee, but delivers them with the physical oils, body, and intensity unique to espresso. This combination creates an incredibly large, persistent flavor and a lingering aftertaste that standard filter methods or traditional espresso shots cannot achieve on their own.
The primary challenge when dialing in an Allongé stems from its incredibly fast flow rate, which typically targets 4 to 4.5 ml/s under full espresso pressure. Because water is being forced through the coffee puck so rapidly, even microscopic adjustments to your grind size or your dose weight will trigger massive, unpredictable swings in pressure. Unlike traditional, slower-moving espresso where minor tweaks result in small changes, a fast-flowing Allongé requires highly meticulous, tiny adjustments to keep the profile from veering completely off course.
As the fast-flowing water strips soluble materials from the coffee during extraction, the physical structure of the puck naturally begins to degrade. If the grind is slightly too coarse or the puck preparation is imperfect, the pressure will sharply drop as the puck falls apart. A successful Allongé profile manages to maintain adequate pressure (around 8 bar) even toward the end of the shot, preventing a total flow crash and ensuring a balanced, high-extraction beverage without excessive astringency.
When compared to an Allongé, simply over-extracting a standard espresso shot to fill a larger cup results in a bitter, unpalatable liquid at the end of the brew cycle. If you want a longer drink but aren't pulling a true Allongé, you are far better off pulling a clean, tightly controlled traditional espresso shot and diluting it with clean, freshly boiled kettle water. Pushing an immense volume of water through a standard espresso grind profile eventually destroys the puck structure, yielding unpleasant flavors rather than the rich, aromatic body of an Allongé.