First, place the chocolate cubes in a small saucepan over low heat and stir vigorously until the chocolate is completely melted.
Then pour the wine, then add the cinnamon and cloves. Stir and heat the wine until foamy. If you heat it more than necessary, more alcohol will evaporate. When you remove from the heat, add the orange juice and stir.
Put the wine in glasses and decorate it with slices of orange. Enjoy!