Get the molasses runnier by heating it with half the white rum for about a minute on high heat. Stir continuously! Set aside to cool whilst you prepare the rest of the ingredients.
Grease a 10-inch round cake tin and line it with a layer of baking parchment paper.
Preheat the oven to 150°C fan or 325 °F or gas mark 3.
In a kitchen bowl, sift the plain flour and the baking powder. Add and combine the ground allspice, cinnamon powder and freshly grated nutmeg. Set aside.
In a mixing bowl, whisk together the butter and dark brown sugars until creamy.
Whisk together the eggs, lemon juice and lemon zest. Add it a little at a time to the cream butter and sugar.
Add the flour mixture a little at a time. Fold in using a wooden spoon. Don't overwork the batter or the fruit cake will turn out dense.
Add the blended fruit, vanilla extract, rose water, browning sauce, molasses and the rest of the rum. Combine without overworking the batter.
Pour the mixture into the prepared baking pan. Bake in the preheated oven for about 2 hours, until a toothpick in the middle comes out clean.
Remove from oven and place on a rack to cool. Once cool, spray the cake with 1/4 cup/100ml of rum and wine. The ratio of rum to wine is up to you.