Preheat your oven to 325°F (160°C). Grease and flour a 9-inch round cake pan or line it with parchment paper.
In a large mixing bowl, cream together the butter and brown sugar until light and fluffy. Add the eggs one at a time, beating well after each addition.
In a separate bowl, whisk together the flour, baking powder, cinnamon, nutmeg, cloves, and salt.
Gradually add the dry ingredients to the creamed butter and sugar mixture, alternating with the orange juice and rum (or brandy). Mix until just combined.
Fold in the raisins, currants, apricots, cranberries, and nuts (if using) until evenly distributed throughout the batter.
Pour the batter into the prepared cake pan and smooth the top with a spatula.
Bake in the preheated oven for about 1 hour and 30 minutes, or until a toothpick inserted into the centre of the cake comes out clean.
Remove the cake from the oven and let it cool in the pan for 10 minutes. Then, transfer it to a wire rack to cool completely.
Once the cake is completely cooled, you can decorate it with icing, frosting, or marzipan if desired. Enjoy your homemade Christmas fruit cake!