The dark, delicious and stimulating coffee bean is believed by many coffee experts to have originated from East Africa, where it was first grown sometime in the 14th century. It then made its way to Northern Africa in the 1600s before spreading to other parts of the world.
Sugar actually came from New Guinea before making its way to foreign lands like America via the Middle East more than 12,000 years ago. It is believed that in the attempt of the Arabs to conquer Southern Africa, they spread sugar throughout the region, which eventually made its way to Spain and became popular in Europe and the rest of the western world.
While rice is able to be grown quite well on foreign non-African soil, African slaves are the ones credited with teaching foreigners (Americans to be precise) how to properly irrigate a rice field and thus grow rice.
This is one of the most widespread spices in the world and though it is largely identified with the Asians, its origin can be traced to Africa from the time of early railway construction to Uganda, when the British imported a lot of Indians who came to Africa with curries.