Ximenia afra

Ximenia afra, the sourplum, is a small tree or small shrub that is thinly branched. It is part of the Olacaceae family which is native throughout tropical regions. In particular, the sourplum is native to regions in South East Africa, mainly Botswana, Kenya, Malawi, Mozambique, South Africa, Tanzania, Uganda, Zambia, and Zimbabwe. Sourplum fruits are generally sour, with a dry aftertaste, and contain significant amounts of potassium. The tree is fairly hardy, with frost resistance and drought tolerance. The tree, fruit, seed, leaves, and roots are all used for human consumption, medicinally, or for fuel....read more on Wikipedia.