Step by step

Pour everything into a saucepan and warm until melted over a low flame; remove from the flame and add the raisins to the water and rum

Tips
To make this cake even more tasty you can decorate the cake and sprinkle the surface with icing sugar. But remember to do the latter when the cake has cooled, otherwise the sugar will simply be absorbed.
Trivia
Raisins are basically desiccated grapes, a process that has been performed since time immemorial so that you can preserve the fruit for long periods and eat them out of season. The raisins have delicate skin and a rich flavour but contain a large quantity of sugar, so don’t overdo it! Raisins are often used in recipes for cakes, biscuits, the classic panettone and in many other ways.