Orange granita

Instructions

• Thinly pare the orange and lemon zest, and set aside for decoration.
  Cut the fruits in half, and squeeze the juices into a jug. Set aside.
• Heat the sugar and 500ml/16fl oz water in a heavy saucepan, stirring
  until the sugar has dissolved. Bring to the boil, then boil without stirring
  until a syrup forms.
• Remove the syrup from the heat, add some of the orange and lemon
  zest, and shake the pan. Cover and leave to cool.
• Strain the sugar syrup into a shallow freezer container, and add the fruit
  juice. Stir well to mix, then freeze, uncovered, for about 4 hours until
  slushy. Remove the half-frozen mixture from the freezer and mix with a
  fork, then return to the freezer and freeze again for at least 4 hours.
• To serve, turn into a bowl and leave to soften for about 10 minutes, then
  break up again and pile into long-stemmed glasses. Decorate with strips
  of orange and lemon zest.