From its soothing aroma to tantalizing flavor; everything that you love about coffee boils down to the roasting process.
Raw coffee beans are green in color. The roasting process converts fresh, green coffee beans to brown and gives coffee them a distinct aroma and flavor.
The key to roasting the perfect coffee depends on some essential factors. Let’s take a look at them:
Rate of rise
First and foremost, the rate of rise is the speed that temperature rises or decreases during the roasting process. A steadily decreasing rate of rise leads to the perfect roast.
Another important element is the airflow. The basic rule is the higher the airflow, the greater the convective heat transfer. As a result, increasing the airflow gradually during roasting helps produce the smoke and chaff of coffee.
Roast time depends on several factors, which includes the age, quality and grade of beans, moisture content, weather conditions, and more. Roast time will affect the taste, flavor and color of coffee beans.
Fast roasting will release more aroma compounds and elevate the flavors of the coffee.
Roast masters use a color meter to check the roast degree. Broadly speaking, light roasted coffee has higher levels of acidity than dark roasted coffee. Dark roasted coffee is bitter.
Similarly, light roasted coffee has a fruity flavor because of high amounts of 5-hydroxymethylfurfural, while dark roasted coffee has a burnt flavor.
As roasting progresses, 5-hydroxymethylfurfural breaks down to less fruity compounds, while sulfuric compounds increase. This leads to the production of burnt flavors.
Once the beans are roasted, they are in a fragile condition. At this particular stage, any changes in temperature can adversely affect the roast.
Roasted coffee is then cooled down to prepare it for the grinding and brewing processes.
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