The English term for coffee Roasting is "coffee roasting." Coffee roasting is the process of transforming green coffee beans into aromatic and flavorful roasted coffee beans. This process involves applying heat to the beans, causing them to undergo chemical changes that result in the development of desirable flavors and aromas.

Coffee roasting begins with selecting high-quality green coffee beans. These beans are typically sourced from various regions around the world, each offering unique flavor profiles. The first step in the actual roasting process is preheating the roaster to a specific temperature, usually between 180-200 degrees Celsius.

Once preheated, the green coffee beans are loaded into a rotating drum inside the roaster. As they rotate, hot air circulates around them evenly, ensuring uniform heating. The initial stage of roasting is called drying or yellowing phase because moisture within the bean evaporates.

As time progresses and temperature increases further, a series of chemical reactions occur within the bean known as MaillaRD reactions. These reactions produce complex compounds that contribute to aroma and flavor development in roasted coffee.

The next stage is referred to as first crack – an audible sound produced by expanding gases within the bean as it reaches a certain temperature range (around 205 degrees Celsius). First crack signifies that internal pressure has built up enough for carbon dioxide gas to escape from within.

Roasters have different preferences when it comes to roast levels – light roast, medium roast or dark roast – depending on desired flavors and aromas. Lighter-roasted coffees tend to retain more acidity and showcase origin characteristics while darker-roasted coffees exhibit bolder flavors with reduced acidity but increased bitterness.

After reaching their desired roast level, roasted coffee beans need some time for degassing before being packaged or brewed. During this period called resting or degassing phase (typically 12-24 hours), carbon dioxide continues to escape from the beans.

In conclusion, coffee roasting is a crucial step in the coffee production process. It involves applying heat to green coffee beans, resulting in chemical changes that enhance flavor and aroma. From selecting high-quality beans to determining roast levels, each stage contributes to the final product enjoyed by millions of people worldwide.