Ingredients

  • 1 vanilla bean, split lengthwise
  • 1 cup plus 2 tbsp sugar
  • 1 tbsp instant coffee
  • 1 tbsp boiling water
  • 6 large egg yolks
  • 1/4 cup Marsala
  • 1 1/4 cups heavy cream
  • 2/3 cup plain low-fat yogurt
  • 1 cup chopped pistachios, plus more for garnish
  • Rose petals, for garnish (optional)
  • 8 in (20cm) square metal cake pan

Method

  • Lightly oil an 8 in (20cm) square metal cake pan and line it with a sheet of plastic wrap.
  • Scrape the seeds from the vanilla bean into a saucepan.
  • Add the sugar and 1/2 cup water.
  • Stir over medium heat until the sugar dissolves.
  • Boil without stirring about 3 minutes, until syrupy.
  • Dissolve the coffee granules in the boiling water, and stir into the syrup.
  • Beat the egg yolks and Marsala in a large bowl with an electric mixer.
  • Beat in the coffee syrup in a steady stream, and beat about 6 minutes, until thick and tripled in volume.
  • Whip the cream in a chilled bowl until soft peaks form.
  • Fold into the egg mixture with the yogurt and 3/4 cup of the pistachios.
  • Spread the cake pan and sprinkle with the remaining pistachios.
  • Cover with plastic wrap and freeze for 45 hours, until firm.
  • Invert the pan to unmold the semifreddo onto a chilled platter, remove the plastic wrap, and turn right side up.
  • Cut into squares with a knife dipped in hot water.
  • Serve immediately on chilled dessert plates, sprinkled with more pistachio nuts and rose petals, if using.