Rum raisin tiramisu

Name: Rum raisin tiramisu
Prep time: 20 min
Cook time: 1 min
Total time: 21 min
Cuisine: Italian
Ingredients: 130g raisins; 280ml dark rum; 6 extra-large egg yolks, at room temperature; 100g caster sugar; 450 to 550g Italian mascarpone cheese; 185ml freshly squeezed orange juice, divided (2 oranges); 1 1/2 tsps good vanilla essence; Seeds scraped from 1 vanilla bean; 24 to 30 Italian ladyfingers, or savoiardi; Semisweet chocolate, shaved