Soak the Raisins: In a bowl, soak the raisins in dark rum for about 30 minutes. This step will plump the raisins and infuse them with rich flavor.
Prepare the Mixture: In a bowl, beat the softened butter with sugar until creamy. Add the eggs, one at a time, ensuring each is well incorporated before adding the next. Gradually mix in the milk until the mixture is smooth.
Combine Dry Ingredients: In another bowl, sift together the flour, baking powder, cinnamon, and salt. Mixing these dry ingredients ensures an even texture.
Integrate Dry with Wet Mixture: Slowly add the dry mixture to the wet mixture, stirring gently until just combined. Be careful not to over-mix!
Add Raisins and Rum: Gently fold in the soaked raisins along with the remaining rum from the bowl. This adds a delightful burst of flavor to the batter.
Bake: Preheat your oven to 180 °C (350 °F). Pour the batter into a greased cake pan and bake for 45-50 minutes, or until a toothpick inserted in the center comes out clean.
Cool and Serve: Allow the cake to cool in the pan for a few minutes, then transfer it to a wire rack to cool completely. Enjoy this incredible cake warm or at room temperature!