In Austria, where this cake originated, it is called ‘Besoffener Capuziner’, which can be translated as Tipsy Friar. In this version, there is enough rum for flavour, but not enough to make you tipsy!
In a small bowl, soak the raisins in the rum for 30 minutes. Preheat the oven to moderate 180°C (350°F/Gas 4). Brush a 1litre kugelhopf or ring mould with melted b