Combine dried fruits, brown sugar, oil, water or orange juice, molasses, and mixed spice in a medium saucepan and bring to a gentle boil over medium heat, simmering for 5-7 minutes.

Let the mixture cool to room temperature.

Preheat the oven to 170°C (340°F) and prepare a loaf pan with parchment paper.

In a bowl, whisk together the eggs and vanilla extract.

Pour the egg mixture into the cooled fruit mixture and stir to combine.

In another bowl, whisk together flour, baking powder, baking soda, and salt.

Gently fold the dry ingredients into the wet mixture until just combined.

Pour the batter into the prepared loaf pan and smooth the top.

Bake in the preheated oven for 55-65 minutes or until a skewer inserted in the center comes out clean.

Let the cake cool in the pan for 10 minutes before transferring to a wire rack.

Brush the warm cake with a bit of rum or brandy if using.

Wrap the cooled cake tightly and store.