Which type of coffee bean is known for its strong, bitter flavor?

Robusta coffee beans are renowned for their strong, bitter flavor profile. This characteristic is primarily due to the higher caffeine content found in Robusta beans, which is almost double that of Arabica beans. The elevated caffeine levels contribute to their bold and sometimes harsh taste, which can be perceived as bitter.

In addition to their flavor, Robusta beans are also generally considered more resilient to pests and diseases, often leading to a stronger growth in various agricultural conditions. This hardiness, combined with their distinctively strong flavor, makes them a popular choice for espresso blends and instant coffee, where a robust presence is desirable.

The other types of coffee beans, such as Arabica, Liberica, and Excelsa, have different flavor profiles that tend to be smoother, fruitier, or even floral, lacking the pronounced bitterness associated with Robusta.