The History and Brewing Basics of Espresso

If you’ve ever wondered why most espresso machines still look and work roughly the same way they did 70 years ago—or why your home machine just can’t pull a shot with the same richness as your favorite café’s—this article is for you. We break down the unspoken rules of espresso: how the machines evolved, which beans are actually used in blends, what temperature really does, and why certain designs (like the beloved E61 grouphead) still have fans decades later.

In short: the modern espresso machine as we know it was born in 1948 with Gaggia’s piston-driven pump machine. While the basic design hasn’t changed much, details like exposed E61 groupheads have fallen out of fashion, and today’s high-end machines often use aluminum boilers instead of copper. Ideal brewing temperature? Around 90.5°C—but it’s not set in stone.

The Evolution of the Espresso Machine

Most coffee books credit Gaggia’s 1948 piston pump machine as the start of the modern commercial espresso machine. For nearly 60 years, the core design and function of espresso machines have remained largely unchanged. One major shift, however, is the decline in popularity of the classic E61 grouphead with its exposed brass or copper design. Personally, I love the vintage look of those old copper machines, though they come with inevitable issues like staining and oxidation. Today, mid- to high-end machines—such as those from Conti or Starbucks’ La Marzocco—typically use aluminum boilers. Conti machines, made in France, are also used by Coffee Beanery. You can still find E61 machines from brands like Faema, and even manual piston machines exist, though pressure consistency is unreliable. The earliest movie cameras were hand-cranked, and just like with those, maintaining proper pressure in a manual espresso machine is a skill—without enough pressure, you won’t get crema.

Common Espresso Beans and Blends

Coffee beans are generally divided into Arabica and Robusta. Arabica is usually considered higher quality but is harder to grow and more vulnerable to pests. Robusta, on the other hand, is extremely hardy and the base of most instant coffee—but it’s also used in some espresso blends because it helps produce more crema. For example, Lavazza’s Grand Espresso blend is 60% Arabica and 40% Robusta. Most espresso is a blend, aiming for balance and consistency. In Shanghai, lightly acidic espressos are often seen as flawed—a result of the Starbucks effect—but acidity in espresso is difficult to control and demands high barista skill. Espresso blend recipes are trade secrets, though not as closely guarded as Coca-Cola’s formula. Illy uses 100% Arabica, while Lavazza offers several blends. Robusta boosts crema and caffeine but is usually added for cost and texture, not flavor. Many domestic roasters use single-origin beans like Brazilian or Yemeni Mocha for espresso, but limited access, inconsistent roasting, and poor green bean selection often hold back quality.

The Ideal Espresso Brewing Temperature

The commonly cited ideal temperature for espresso brewing is 90.5°C. This isn’t an official standard but rather an empirical value refined through experience—much like traditional medicine. Below this temperature, espresso tends to taste sour and astringent; too high, and it becomes bitter. I once had issues with my machine running below 80°C, and the resulting bitterness made me think the beans were at fault—until I measured the water temperature. That said, 90.5°C isn’t a universal rule. Experienced baristas adjust for altitude and other variables; for instance, brewers at high elevations may slightly increase temperature, and French press coffee often uses water around 95°C. Don’t treat 90.5°C as gospel.

Why Classic Machines Still Matter

Gaggia still manufactures espresso machines, but their technology has fallen behind, and build quality has reportedly declined. It’s a reminder of how much the industry has moved on. The classic E61 grouphead, with its elegant, exposed design and copper construction, is no longer mainstream—but it remains a favorite among enthusiasts for its aesthetic and mechanical heritage. Modern machines from makers like La Marzocco and Conti favor durability and consistency, often with aluminum components. Even manual piston machines survive, but achieving proper brewing pressure is a challenge without precise engineering.

Frequently Asked Questions

When was the modern espresso machine invented?

The modern espresso machine was invented in 1948 by Gaggia, featuring a piston-driven pump mechanism. This design became the foundation for most commercial espresso machines used today.

What is an E61 grouphead and why is it special?

The E61 grouphead is a classic espresso machine component with an exposed brass or copper design, valued for its craftsmanship and vintage aesthetic. Though no longer common in modern machines, it is still favored by enthusiasts for its traditional look.

What’s the best temperature for brewing espresso?

The commonly recommended brewing temperature for espresso is around 90.5°C. Going below this can result in sourness, while going above may make the shot taste bitter. However, this is not a fixed rule and can vary with equipment and altitude.

Are Robusta beans used in espresso blends?

Yes, Robusta beans are sometimes added to espresso blends—typically around 40%, as in Lavazza’s Grand Espresso—to enhance crema production and lower costs. They are less common in single-origin or acidic espresso profiles.

Why don’t modern machines use exposed E61 groupheads anymore?

Exposed E61 groupheads have fallen out of favor mainly due to changing aesthetics and maintenance concerns. Modern machines favor enclosed, durable designs—often with aluminum boilers—for consistency and easier care.

What makes espresso blending a secret process?

Espresso blend recipes are closely guarded trade secrets. Each roaster fine-tunes the ratio of beans to achieve specific flavor balance, crema, and body—similar to how Coca-Cola protects its formula.

Recommended FrontStreet Beans for Espresso

For espresso brewing, try FrontStreet Coffee’s Classic Blend, known for its balanced body and rich crema—ideal for traditional espresso drinks. Their Ethiopia Humbera single origin brings bright acidity and floral notes, offering a unique twist on espresso. Alternatively, the Brazil Queen Manor offers low acidity and chocolatey sweetness, perfect for a smooth, classic shot. All beans are freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.