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, combine the mixed dried fruit, chopped nuts, and candied citrus peel (if using). Set aside.
In another bowl, whisk together the flour, baking powder, cinnamon, nutmeg, and salt.
In a separate large bowl, mix the brown sugar, granulated sugar, and vegetable oil until well combined. Add the eggs one at a time, beating well after each addition. Stir in the vanilla extract and orange juice.
Gradually add the dry ingredients to the wet mixture, stirring until just combined. Fold in the fruit and nut mixture until evenly distributed. If using, stir in the brandy or rum.
Pour the batter into the prepared cake pan and spread it evenly.
Bake for 50-60 minutes, or until a toothpick inserted into the center comes out clean.
Allow the cake to cool in the pan for 10 minutes before transferring it to a wire rack to cool completely.