How to Roast Coffee
for the Best Espresso Yet!

Ah, coffee! That magical bean that gets you up and moving every morning. But how to roast coffee beans in your own home? Let's see...

Those little beans go through a lot to get to your cup and pep you up every morning. They start as freshly harvested, green coffee bean and get converted to the glorious brew you savor everyday. That’s right. Those beans start out green. Once they’re roasted they turn the rich brown we all know and love.

And the roasting process is about as varied as the latte orders you might hear in line every morning. There are easily half a dozen different methods for how to roast coffee beans, each of them with their own merits. Before we get to the methods, there are a few basic requirements for roasting coffee.


Roasting Requirements

• Generally the beans are roasted at very high temperatures, between 460F and 530F.
• The beans must move around! This is to avoid uneven roasting or worse, burnt beans. Air, stirring and tumbling are common ways to keep the beans on the move.
• When the roasting is done, the beans must be cooled promptly.

There are two types of roasters for home use: fluid bed and drum roasters. Each machine roasts the beans and makes sure they are cooled properly.

Generally, because of the quick heating times of the fluid bed roasters, coffee roasted with this method tends to be more acidic, while drum roasted coffee is often fuller in body. Personal preference will help you choose.

The best home coffee roasters today, using one of these two methods can reproduce and surpass many professionally roasted beans on the market.

Drum Roasters The drum roaster is a method that relies on the constant movement of the coffee beans. These machines are fairly simple to operate. Often it is simply a matter of loading your fresh beans into the roaster and setting a time. With some experimentation, you'll decide how long you want your beans roasted.

Fluid Bed Fluid bed roasting utilizes air flow instead of bean movement, allowing for substantially faster heating times (hence the acidity). However, the ability to adjust fluid levels, airflow, and time spent in the roaster make fluid bed roasting slightly more adjustable for the home coffee roaster.

Home Roasters and Recommendations

How to Roast Coffee - Without a Roaster

I do not recommend the following methods but wanted to mention them. Espresso uses a very dark roast and if you cross that line, the beans will burn and possibly catch fire. These methods also produce smoke and the smell can radiate through the whole house for days! Never leave roasting beans unattended! If you try these methods, you are on your own!

Popcorn Poppers A popcorn popper will provide the even air flow and high temperatures needed for a nice clean roast. And it’s fairly simple, merely tossing your green coffee beans into a popcorn popper and keeping a close eye on them. Because this techique uses air to roast, the chaff (outer skin of coffee bean) will come flying out of the popper. You may want to roast outside, if possible. This one can get messy!

Oven Roasting Another simple method is the use of an oven. Ovens offer ample space, easily controlled temperatures, and efficient venting when experimenting with how to roast coffee. While this method requires patience and careful attention, properly oven roasted coffee beans can have a quality of taste that very few other beans carry. To cool the beans, dump into a metal colander and stir. The chaff of the bean will come off so either stir over a sink or outside.

Frying Pan How about the frying pan method? If done properly, a frying pan can give you perfectly roasted beans. Because the temperature is never quite as high with stove top pan-frying, you will need to constantly move the beans, never setting the pan down or walking away. To cool the beans, dump into a metal colander and stir. The chaff of the bean will come off so either stir over a sink or outside.

When learning how to roast coffee, there are multiple options, from the oldest in the book – pan frying – to the best home coffee roasters on the market. No matter what you decide though, you’ll be getting coffee that’s fresh and roasted to exactly how you like it.

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