Ducana is a sweet potato dumpling from Antigua, St. Vincent and the Grenadines and many other Caribbean islands.They are made from grated sweet potatoes, grated coconut, sugar, flour, coconut milk, and/or water,raisins, ginger, grated nutmeg, salt and essence or vanilla extract. The mixture is combined in a bowl until it thickly coats the back of a spoon. The cooking method is quite simple, but what is often debated is the wrapping.