Making coffee required discovering a long elaborate process, unlike most foods and drinks

Evidence

Coffee is better documented. It originated in Ethiopia, probably taking its name from the province of Kaffa, where coffee grows wild. One can only marvel at the ingenuity of the people who discovered how to make coffee from the coffee bean. Most of the basic foodstuffs and drinks are fairly simple; for coffee, they had to go through a long and elaborate process in order to get drinkable coffee from the beans that grow wild in Kaffa. — Bernard Lewis, From Babel to Dragomans, 255

Categorization

• QUESTION: What exactly was the elaborate process, and how would anyone have stumbled onto it? Worth chasing the Ethiopian origin story of coffee processing.