Blog Nᵒ 4: The Tale of Two Roasts: Understanding Filter Roast and Espresso Roast
When it comes to coffee, there’s a universe of nuances and details that contribute to the final cup. One distinction often overlooked is the roast profile: filter roast versus espresso roast. It's not just about the brewing methods; it's about the roasting technique tailored to those brewing methods. Let's delve into the differences and why you can't just pull a pleasant espresso shot with filter roast coffee.
What is a Filter Roast?
Filter roasts are generally lighter, aiming to accentuate the coffee's origin flavors. This type of roast is designed to shine in brew methods like pour-over, AeroPress, and French press. When roasted, these beans undergo less time in the roaster, preserving acidity and highlighting a coffee's natural flavors—think floral, fruity, and nuanced.
What is an Espresso Roast?
On the other end of the spectrum, we have espresso roasts—typically a medium to dark roast. These roasts undergo a longer roasting process, resulting in a more substantial body with notes of chocolate, caramel, and nuttiness. The idea behind an espresso roast is to create a balanced profile that will hold up under the high pressure of espresso brewing, which extracts flavors much more quickly than other methods.
Why Can't I Pull a Good Espresso Shot with a Filter Roast?
Now, you might ask, what's stopping me from using filter roast beans in my espresso machine? The answer lies in the brewing mechanism itself. Espresso machines use high pressure to force water through finely-ground coffee in about 25–30 seconds. With a filter roast, the quick, high-pressure extraction can result in a shot that is overly acidic and lacks the complexity and balance that an espresso roast offers.
Filter roasts are not designed to withstand such an aggressive extraction process. You might get a shot, but it won't do justice to the nuanced profile that the coffee beans may possess. It will be like trying to read a poem at a rock concert—overwhelmed and out of place.
Understanding the roasting process can elevate your coffee experience. While it might be tempting to use that bag of filter roast beans for espresso, remember that roasters have tailored the bean's profile for a reason. Whether you are a café owner or a home brewer, choosing the right roast for your brew method is critical in getting that perfect cup.
So the next time you're brewing your coffee, think about the roast. Are you using a filter roast for a slow brew method, or are you pulling an espresso shot with a darker, more robust espresso roast? Knowing the difference will ensure that your coffee is always the best it can be.