It seems most Africans/tribes have particular staple food types and they have connotations to their staple foods as you have put it. In Uganda for example; Baganda eat Matooke (food banana), Bakiga eat potatoes both sweat potatoes and Irish potatoes, Acholi, Langi, Madi, Alur, Lugbara, Baluli, Itesot, Bagwere, Banyoro, Batooro, Kumam, some Basoga from Kaliro and Basoga of Namutumba enjoy eating finger millet. Banyankole eat matooke as if it is their staple food yet they are originally known for eating finger millet too. Basoga eat potatoes but they mainly have connotation to maize (posho) and this is their staple food. But Uganda is endowed to the extent that there are lots and lots of food stuffs that people find themselves eating. They eat any type of food for a meal. So things have changed now.