Is Pre-Infusion Really Important for Espresso? A Simple Guide to Better Extraction

 A while ago, a friend of mine updated his La Marzocco Home App, and he turned off the pre-infusion function. I asked him why he did that, and he said it felt useless. After I emphasized how important pre-infusion is, he quietly turned the setting back on. Haha. That little incident gave me an idea—why not make a post dedicated to talking about the importance of pre-infusion?

To be honest, whether pre-infusion is truly important doesn’t seem to have a single absolute answer. For people chasing the ultimate flavor in espresso, it’s a core variable. But for someone who simply wants a stable, decent cup of coffee, it’s just another machine parameter.

Before we decide whether it’s important or not, we should first understand what pre-infusion actually is and what role it plays during espresso extraction.

Simply put, you can think of pre-infusion as watering a dry sponge. If you skip pre-infusion and start extraction right away, high-pressure water blasts through the coffee puck immediately. The water doesn’t have time to fully absorb—it rushes through quickly. The surface of the sponge gets wet, but the inside remains dry.

With proper pre-infusion, however, a small amount of water first wets the puck. After a few seconds, continuous water flow follows. The sponge gradually absorbs water evenly from the inside out.

This analogy makes it easier to understand one of the biggest benefits of pre-infusion: reducing channeling. High-pressure water naturally looks for the easiest path. If the coffee puck has cracks or uneven density, the water will concentrate in those weak points, causing parts of the coffee to be over-extracted while others remain under-extracted. Low-pressure pre-infusion allows water to slowly saturate the entire puck, giving the coffee bed time to “self-adjust” before full pressure is applied.

Another important factor is freshly roasted coffee beans. Fresh beans contain a large amount of carbon dioxide. If you immediately apply high pressure, the gas can block proper contact between water and the coffee grounds. During pre-infusion, low-pressure water enters slowly and allows gas to escape, making it easier for water to penetrate the puck during the main extraction.

A well-controlled pre-infusion can also reduce sharp acidity and harshness while increasing sweetness and roundness in the cup. This effect is especially noticeable with light-roasted beans, which tend to have higher density and stronger gas release.

Of course, if the pre-infusion time is too long, it may start dissolving undesirable flavors too early. In most cases, depending on the beans, a pre-infusion time of around 5–10 seconds works well.

At this point, some people might wonder: many coffee machines don’t even have a pre-infusion function. If it’s not standard, does that mean it isn’t that important?

The main reason many entry-level home espresso machines don’t include pre-infusion is cost. Developing and implementing this feature adds complexity, and for most home users, the educational and knowledge barrier is relatively high. In other words, many consumers either don’t know about it or don’t care much about it. When consumer awareness is low, manufacturers naturally have less incentive to invest heavily in it.

However, if you look at higher-end espresso machines, you’ll find that pre-infusion is almost always included. It’s one of those features that represents an “invisible improvement”—something that quietly enhances the quality of extraction.

So what if your home machine doesn’t have a dedicated pre-infusion function?

There’s actually a simple and low-cost workaround. Turn on the pump for 3–5 seconds, then stop it. Wait about 10 seconds, and then start the extraction again. This simple method can mimic a basic form of pre-infusion.

On high-end commercial machines, the system often includes a gradual pressure ramp, segmented pre-infusion stages, or even ultra-low-pressure pre-infusion, where water almost gently seeps into the puck.

Some fully automatic machines simulate pre-infusion by briefly pausing after wetting the grounds, although their pressure curves are fixed and cannot be finely adjusted.

In the end, pre-infusion is not a mandatory step in espresso extraction, nor is it some kind of magic solution. But using it more often can help ensure that when high pressure is applied, the water meets a coffee puck that is already evenly saturated and prepared—rather than blasting directly into something like a completely dry sponge.

Best Coffee Beans for Making Coffee Combos: Barista Tips on Roast, Fermentation, and Flavor Balance

 By splitting a single espresso extraction into two or three portions and turning each one into a different type of drink before serving them together, cafés have created one of today’s most popular formats — the Coffee Combo.

This trend has taken off because it allows customers to experience multiple “dishes” made from the same coffee bean, while each cup remains small and easy to enjoy without feeling too full. As a result, more and more coffee shops have begun offering Combo sets.

But while it looks simple on the surface, many people find that one of the drinks in their combo doesn’t taste quite right — maybe it’s too bitter, too bland, or lacks aroma. Some even ask, “Did I use the wrong coffee beans?”

The truth is, any coffee bean can technically be used to make a Combo, because as I mentioned, it’s simply a matter of dividing one espresso into multiple portions and crafting different drinks from it. In fact, most espresso-based drinks are made this way.

However, if you want your Combo to stand out — with special aromas, depth, and a memorable flavor — then bean selection does matter. Your beans should have strong fragrance and a rich flavor profile. That’s exactly why cafés tend to use certain types of beans for Combo recipes.

So today, let’s talk about what kinds of coffee beans work best for Coffee Combos!

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1. The Roast Level Shouldn’t Be Extreme

If you want to create a Combo with rich aroma and distinct flavor, avoid using very dark roasts. Deep roasting introduces strong smoky notes and a heavy body, which can easily mask the coffee’s natural flavors. (Dark roasts aren’t bad — they’re just not ideal for this particular purpose.)

Likewise, beans that are too lightly roasted aren’t suitable either. While light roasts retain delicate notes without smoky interference, they lack enough caramelization, resulting in lower sweetness and higher acidity. The flavors are often too faint to stand up to milk, so milk-based drinks may taste weak or flat.

That’s why medium-light or medium roast beans are the best choice for Combos. They preserve vibrant flavor, offer enough sweetness through caramelization, and have enough strength to balance milk-based drinks like lattes and cappuccinos.

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2. Deeper Fermentation Means Stronger Flavor

If you want your coffee to have a bold and expressive flavor, pay attention to the processing method. Choose beans that have undergone deeper fermentation, such as natural, anaerobic, or honey-processed coffees.

As I’ve shared before, different processing methods lead to different fermentation levels. The deeper the fermentation, the richer and more pronounced the coffee’s aroma becomes. Naturally processed and anaerobic coffees, in particular, tend to develop vibrant fruit notes and complex layers of flavor — perfect for creating a Combo that stands out.

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3. Beans That Fit These Criteria

Plenty of beans meet these two standards — moderate roast and deep fermentation. In fact, over half of the beans on my own menu fit the bill. Many cafés prefer these for their Combo offerings because they deliver both intensity and distinction.

Here are a few popular examples you can try:

• Ethiopia Alo – expect notes of mango, pineapple, citrus, and magnolia.

• Boundary Estate “Xizhua” – features flavors of grape, passion fruit, floral tones, and fruit wine.

• Geisha Blend “Strawberry Candy” – a fragrant mix of strawberry candy, white blossoms, and citrus brightness.

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4. Key Tips for Making a Great Coffee Combo

Once you’ve chosen the right beans, it’s time to brew — and there are a few important things to keep in mind:

(1) Coffee Dose

Because the espresso needs to be divided into multiple drinks, unless you already use a higher dose, it’s best to slightly increase the coffee grounds. Typically, espresso is extracted at a 1:2 ratio, and using too little coffee means that each portion will be too small, leading to tiny final servings. (This matters more for cafés; home users can be flexible.)

(2) Espresso Extraction

In cafés, after dialing in their espresso each morning, baristas usually make a test latte to ensure the espresso base works well with milk. Why? Because a great-tasting espresso doesn’t always make a great-tasting latte.

If the espresso isn’t strong enough or has too much acidity, the milk-based drink will taste weak or off-balance. Milk-based coffees like lattes require a bit of bitterness in the espresso to balance the milk’s sweetness and create a full-bodied flavor — something black coffees like Americanos don’t need as much.

That’s why, when making Combos, many cafés pull slightly longer shots for the latte portion. This boosts bitterness and balance, resulting in a more pronounced and satisfying latte flavor.

(3) Ratio Between Coffee and Other Ingredients

Finally, let’s talk about ratios. Because Combo beans are often roasted lighter than standard espresso blends, you should adjust your ratios accordingly.

For example, in a regular latte using a medium-dark espresso blend, the ratio might be 1:5 — that is, 40ml espresso with 200ml milk. But when using a lighter roast (like the Boundary Estate “Xizhua”), a ratio closer to 1:4 or 1:4.5 works better.

The reason is simple: lighter roasts have lower flavor intensity, so using too much milk or water will dilute the coffee’s character.

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Final Thoughts

These are some of the main considerations when selecting coffee beans and preparing your own Coffee Combo. Of course, these are just general guidelines — the perfect combo will always depend on your specific beans, equipment, and personal taste.

Experiment, taste, and adjust — that’s the beauty of coffee. ☕