Dirt is a common craving in many parts of Africa - especially amongst pregnant women who need the nutrients contained within the soil. In Tanzania the special clay soil is known as "udongo wa pemba", Swahili for "The Soil of Pemba". Focus on Africa's Tulanana Bohela travelled specially to the hills of Morogoro to find out what dirt really tastes like...but her journey begins in a famous market in Dar Es Salaam.