Coffee

Coffee is a brewed beverage prepared from roasted seeds, commonly called coffee beans, of the coffee plant. Due to its caffeine content, coffee has a stimulating effect in humans. Today, coffee is one of the most popular beverages worldwide. Coffee was first consumed in the ninth century, when it was discovered in the highlands of Ethiopia. From there, it spread to Egypt and Yemen, and by the 15th century, had reached Azerbaijan, Persia, Turkey, and northern Africa. From the Muslim world, coffee spread to Italy, then to the rest of Europe, to Indonesia, and to the Americas.

Coffee use can be traced at least to as early as the ninth century, when it appeared in the highlands of Ethiopia. According to legend, an Arab goatherder named Khalid noticed that his goats became more lively after eating the berries of the coffee plant. Intrigued, he boiled the berries, thus producing the first coffee. From Ethiopia, coffee spread to Egypt and Yemen. It was in Arabia that coffee beans were first roasted and brewed, similar to how it is done today. By the 15th century, it had reached the rest of the Middle East, Persia, Turkey, and northern Africa.

The Coffea plant is native to subtropical Africa and southern Asia. It belongs to a genus of ten species of flowering plants of the family Rubiaceae. It is an evergreen shrub or small tree that may grow 5 meters tall when unpruned. The leaves are dark green and glossy, usually 100–150 milimeters long and 60 milimeters wide. It produces clusters of fragrant white flowers that bloom simultaneously. The fruit berry is oval, about 15 milimeters long, and green when immature, but ripens to yellow, then crimson, becoming black on drying. Each berry usually contains two seeds, but 5–10% of the berries have only one; these are called peaberries. Berries ripen in seven to nine months.

Most arabica coffee beans originate from either Latin America, eastern Africa, Arabia, or Asia. Robusta coffee beans are grown in western and central Africa, throughout southeast Asia, and to some extent in Brazil. Beans from different countries or regions usually have distinctive characteristics such as flavor, aroma, body, and acidity. These taste characteristics are dependent not only on the coffee's growing region, but also on genetic subspecies (varietals) and processing. Varietals are generally known by the region in which they are grown, such as Colombian, Java or Kona.