Step 1: Preheat Your Oven and Prepare Your Baking Pan

Preheat your oven to 325°F (160°C). Grease a 10-inch (25 cm) bundt pan with butter and lightly dust it with flour.

Step 2: Cream the Butter and Sugar Together

In a large mixing bowl, cream the butter and sugar together until light and fluffy. You can use a hand mixer or a stand mixer for this step.

Step 3: Add the Eggs

Add the eggs, one at a time, and beat well after each addition.

Step 4: Sift and Mix the Dry Ingredients

In a separate bowl, sift together the flour, baking powder, cinnamon, nutmeg, allspice, and salt. Gradually add this mixture to the butter and sugar mixture, mixing well after each addition.

Step 5: Add the Mixed Fruit and Nuts

Fold in the chopped mixed fruit and nuts until well distributed throughout the batter.

Step 6: Pour in the Rum

Pour the dark rum into the batter and stir well to combine.

Step 7: Bake the Cake

Pour the batter into the prepared bundt pan and smooth the top with a spatula. Bake the cake for about 1 hour and 45 minutes, or until a toothpick inserted into the center comes out clean.

Step 8: Soak the Cake in Rum

Once the cake is baked, remove it from the oven and allow it to cool for about 10 minutes. Then, using a toothpick, poke several holes all over the top of the cake.

Pour about 1/2 cup of dark rum over the top of the cake, allowing it to soak in. Repeat this process several times until all the rum is absorbed.