Black cake or dark fruit cake is a type of fruitcake

Fruitcake

Fruitcake is a cake made with chopped candied fruit and/or dried fruit, nuts, and spices, and soaked in spirits. A cake that simply has fruit in it as an ingredient can also be colloquially called a fruitcake. In the United Kingdom, certain rich versions may be iced and decorated...

 traditionally associated with Christmas and weddings. It is typically made with plums and raisins soaked in rum, as well as brown sugar

Brown sugar

Brown sugar is a sucrose sugar product with a distinctive brown color due to the presence of molasses. It is either an unrefined or partially refined soft sugar consisting of sugar crystals with some residual molasses content, or it is produced by the addition of molasses to refined white...

 and a bittersweet caramel called "browning". The wedding version is much stronger than the Christmas one.

It is derived from the English plum pudding. Because Black Cake is soaked heavily in rum, it does not go bad - therefore it can be kept for many years and still be consumed. Traditionally, black cake is served in the Caribbean culture. People of Trinidadian, Jamaican, and Guyanese cultures serve this cake on special occasions.

In St. Vincent and the Grenadines, a special wine, called Black wine is specially produced to be used in the making of black cake. Black cake is traditionally associated with Vincy Christmas.