Missing recipe name and method
Absent the cake portion, the ingredients are precisely as listed for the Waitrose White and Dark Chocolate Tiramisu. Recipe and image courtesy of Waitrose.com

As @ChrisH has suggested, someone may have been modifying the recipe to use ready-made cake, such as a Madeira.




  Coffee chocolate syrup
  200ml strong coffee
  1 tbsp demerara sugar
  75g plain chocolate, finely chopped
  
  Cake
  125g unsalted butter, softened, plus extra for greasing
  225g caster sugar
  2 large eggs, lightly beaten
  1 tsp vanilla extract
  75g plain chocolate, melted
  175g essential Waitrose plain flour
  25g cocoa powder
  1 tsp bicarbonate of soda
  200ml essential Waitrose soured cream
  
  Mascarpone and chocolate cream
  100g white chocolate, chopped
  4 large eggs, separated
  75g caster sugar
  500g mascarpone


And, in the interest of not presenting a full recipe, here is my abridged version of the directions; follow the link for the full details.


  Prepare the cake layers the day before you plan to assemble the tiramisu. 
  
  The next day, prepare the coffee syrup. Pour the hot coffee into a bowl, add the sugar and chopped chocolate and stir until smooth and the chocolate has completely melted.
  
  Prepare the mascarpone cream. Melt the white chocolate in a bowl over a pan of simmering water. Stir until smooth, then set aside to cool slightly. In a bowl, whisk the egg yolks and caster sugar until the mixture has doubled in volume and leaves a ribbon trail when the whisk is lifted. Add the mascarpone and melted white chocolate and whisk again until smooth. In another bowl, whisk the egg whites with a pinch of salt until they hold a stiff peak. Fold the egg whites into the mascarpone mixture using a large metal spoon.
  
  To assemble the tiramisu, spoon a layer of the mascarpone cream into the bottom of each of glass and top with a layer of cake. Drizzle liberally with the coffee syrup. Add another layer of the cream, cake, syrup and a final layer of cream. Serve chilled, perhaps scattered with white and dark chocolate shavings.