Ingredients

  • 50 g no-sugar-added custard powder
  • 50 g mascarpone
  • 3 small eggs
  • 7 tablespoons sugar substitute
  • 40 g cornflour
  • 40 g plain flour
  • 10 g instant coffee granules
  • 5 tablespoons kirsch or 5 tablespoons brandy
  • 450 g black currants
  • 12 teaspoon vanilla essence
  • 142 ml whipping cream
  • 4 (1 ounce) squares diabetic sugar-free dark chocolate, curled using a vegetable peeler

Method

  • Make 600ml/1pt custard using custard powder, following the packet instructions.
  • Add mascarpone.
  • Cover with a sheet of damp greaseproof paper to prevent a skin forming.
  • Cool for 30 minutes.
  • Preheat the oven to 200C / 400F / Gas 6.
  • Whisk the eggs, half the 7tbsp sugar substitute and 2 tbsp hot water in a bowl for 5 minutes until the whisk leaves a thick trail on the surface.
  • Sift the cornflour, flour and coffee granules into the mixture and lightly fold together.
  • Grease a 20cm/8in square cake tin.
  • Spoon in the mixture and cook for 15 minutes, or until a skewer pushed into the centre comes out clean.
  • Remove from the oven and cool.
  • Turn out the sponge and break or cut into bite sized pieces.
  • Put into a serving bowl and sprinkle with the Kirsch or brandy.
  • Wash the blackcurrants and remove from the stalks.
  • Mix with the remaining sugar substitute and vanilla, then spoon on top of the sponge; pour over the custard.
  • Whip the cream until soft peaks form.
  • Spoon into a piping bag fitted with a star nozzle and pipe rosettes over the custard.
  • Curl the chocolate using the vegetable peeler and sprinkle over rosettes.