Prestogeorge Coffee Co.'s Rare Tanzania Peaberry Coffee is an African coffee that is widely reputed as being a sweeter and more delicate cup of joe. Instead of the usual two beans within the coffee fruit, there is only a single bean. This natural mutation only occurs in approximately 3-5% of harvested coffee, and is hand-selected and very rare. This special bean brews a complex and delectable cup. Roasted Full City.