In a saucepan, add rum, dried fruits and nuts and orange peel. Bring this to a boil, and then lower the heat and simmer for 10 minutes. Take this off the heat and set this aside for 1-2 hours, or up to 24 hours in the fridge.
When you are ready to bake the cake, pre-heat oven to 160 C/ 320 F. Line the base and sides of an 8 inch springform cake tin with parchment paper, making sure that the sides of the parchment paper are higher than the cake tin. Watch the video above to see how I do this.
Sift together flour, cocoa powder, baking powder, cinnamon, nutmeg and salt in a large bowl. Add dark brown sugar, butter, almond extract (if using) and eggs and whisk with an electric whisk till combined. Add the soaked dried fruits and nuts and fold with a spatula.
Pour this batter into the prepared cake tin and bake in the oven for approximately 90 minutes. Start checking for doneness around the 80 minute mark. In some ovens, this cake can take up to 2 hours because it bakes long and slow. Use your judgement after the 80 minute mark, and check in 10-15 minute intervals.
Once baked, let the cake cool in the tin for 10 minutes, after which you can take the cake out of the tin or release the sides of the springform tin and let the cake cool completely.