For the chocolate ice cream with raisins, dissolve the cooking chocolate in hot whipping cream, let cool and stir in cocoa powder and maple syrup. Let cool overnight in the refrigerator.
Place raisins and rum in a small jar and let swell overnight. The next day, mix the chocolate mixture well with the raisins and any remaining rum.
Place the mixture in an ice cream maker and stir until the ice cream takes shape. Then serve immediately or place in the freezer until ready to eat. Arrange the chocolate ice cream with raisins in glasses sprinkled with sugar hearts.