coffee · italy
Espresso
espresso
A 25-second extraction under nine atmospheres of pressure that pulled coffee out of the slow drip and into the modern bar — and then, eventually, into nearly every café on Earth.
25 seconds, nine atmospheres, twenty-five millilitres — the rest is argument.
Origin
Espresso is an early 20th-century invention. Luigi Bezzera patented a pressurized brewing machine in Milan in 1901; Pavoni industrialized it shortly after. These early machines used steam pressure (about 1.5 atmospheres) and produced a strong but bitter coffee — a faster pour than drip but not yet recognizable as the modern shot.
The transformative moment came in 1948, when Achille Gaggia in Milan replaced steam pressure with a spring-loaded lever, producing a much higher 8–10 atmospheres of water pressure at lower temperature. The change was technical but the consequence was sensory: the high pressure emulsified coffee oils into a stable cream that floated on top of the cup. Gaggia called it crema caffè naturale — natural coffee cream — and built his marketing around it.
The 9-bar pump espresso machine, evolved through the 1950s and 60s by La Marzocco, Faema, and others, is the direct descendant. Roughly 25 ml of water at 9 bars of pressure, 90°C, through finely ground coffee, in 25 seconds — the modern shot.
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Sensory profile
A well-pulled espresso is dense, bitter, mildly acidic, and topped with a 2–3 mm layer of crema — a tan, slightly viscous foam that holds for 30 seconds before breaking. The crema is the visual marker but the body is the real signature: the high pressure dissolves more soluble solids per gram of water than any other brewing method, producing about 8–12% TDS (total dissolved solids) compared to drip coffee’s 1–2%.
Different beans pull differently. Light roasts under espresso pressure produce sharp, fruity, almost floral shots — the Nordic / third-wave style. Dark roasts produce the chocolate-and-tobacco profile that defines Italian bar espresso. Neither is wrong; they are different aesthetics applied to the same machinery.
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In the cup
Italy drinks espresso fast — a stand-up bar shot, 25 ml in three sips, drunk within minutes of pulling. The grammar of the bar in Naples, Rome, Milan is built around it: morning macchiato, mid-morning cappuccino, post-lunch espresso solo, no cappuccino after eleven (a sociological rule, not a technical one).
Outside Italy, espresso became the engineering core of an entire café vocabulary: latte, cappuccino, americano, cortado, flat white, macchiato. Each is a ratio of espresso to milk to water. Australia and the UK developed the flat white — espresso topped with steamed (not foamed) milk — as the third-wave canonical drink. Specialty coffee shops in Seoul, Tokyo, and Melbourne are now where the most exacting espresso work is happening.
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How to handle
A good shot needs three things in alignment: fresh coffee (within four weeks of roasting), correct grind (fine enough to extract in 25 seconds, not 15 or 40), and proper temperature (90–93°C water). The machine is the smallest variable in modern specialty practice; a thousand-dollar grinder paired with a five-thousand-dollar machine still produces bad espresso if the beans are stale.
References
- Morris, Jonathan. Coffee: A Global History (Reaktion, 2019) — the Italian invention and the post-war Gaggia moment.
- Hoffmann, James. The World Atlas of Coffee (Mitchell Beazley, 2018) — the modern specialty espresso parameters.
- Davids, Kenneth. Espresso: Ultimate Coffee (St. Martin’s, 2001) — the technical history of the 9-bar machine.