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Coffee roasting transforms green coffee beans into the familiar brown coffee bean that we all know. Coffee roasting causes the beans to expand, darken, and change in both flavor and aroma. The longer a coffee bean is in a coffee roaster, the more it changes in both appearance and taste. In terms of color, coffee beans start out green and shift to yellow, light brown, and dark brown as they are roasted. Darker roasts can also appear shiny as oils rise to the beans’ surface. In terms of taste, coffee beans that are lightly roasted taste distinctively of their origin. A light roast Kenyan coffee, for instance, will taste dramatically different than a light roast Brazilian coffee. That is not necessarily the case with darker roasts, where the flavor of the coffee roasting is dominant over the inherent flavor of the coffee bean.

Many coffee roasters are very particular about the degree to which different coffee beans are roasted. The roast profile, which is essentially a recipe for roasting coffee beans, chosen by a coffee roaster will depend upon both the specific variety of coffee bean and the specific flavor characteristics that the coffee roaster is hoping to achieve.

Industrial coffee roasting typically involves roasting the coffee beans in hot gasses. The beans may be held up by a cushion of hot air or they may be on a rotating drum. After roasting, the beans are cooled. Cooling is either done through a vacuum system or a water mist. The water method is typically considered poor practice since it can cause the beans to go stale.

If you can locate a source for green coffee beans, you can roast your own coffee at home. This was once the norm, but home coffee roasting fell out of common practice with the rise of commercially available coffee in the early twentieth century. Home coffee roasting has become increasingly popular in recent years, however, as people recognize that it is the method by which you can get the freshest and most flavorful coffee. Green coffee beans are much more stable than roasted coffee, so roasting coffee at home is an excellent way to ensure that your coffee will be fresh. Similarly, the flavor of coffee peaks shortly after roasting, though the exact time is dependent upon the type of bean, roasting profile, and method of storage. More importantly for many people, a home coffee roaster can choose a bean variety and roast profile to suit his or her individual taste.

The simplest method of home coffee roasting is to use a large pan over a high heat, but this method makes it very difficult to generate a consistent level of roast. Even with vigorous stirring, it is likely that some of your coffee beans will be roasted more darkly than others. A somewhat popular improvisational method is to use a hot air popcorn popper. These work fairly well, but they have a tendency to break down. Coffee roasting takes much longer than popping a batch of popcorn, and few air poppers were built to withstand extended use.

There are also an increasingly wide variety of dedicated home coffee roasters. These coffee roasting machines provide you with greater control over the roasting profile than improvised methods. Moreover, if you use one of these instead of a hot air popper, your popcorn won’t taste like coffee.

Home Coffee Roaster

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