Mi amigo fram St. Kitts does mek kankee wid sweet potatoes, and as for the origin of black cake, rum cake or fruit cake, I was told that it is of British origin, the names of some foods may differ from region to region for eg. cookup is also called all in one. Guyana is rather a complex place rich with diversity too bad the people, do not embrace the rich and diverse cultures with an open mind. A sad state of affairs... <((><
Black cake is another example of British culture being adjusted to suit creole tastes. In fact much of Southern (American) cooking is the same as the cooks were slaves so shifted cooking styles to suit their own purposes.
Sorrel is African (called bissap in Senegal) , ginger beer is both British and African and mauby comes from the Amerindians.