Method

• 1.
  Whisk together 1 cup milk with the sugar, cornflour and cocoa.
• 2.
  Place the remaining milk in a saucepan and bring to the boil.
• 3.
  Pour the milk over the chocolate mixture and stir to combine. Return the mixture to the saucepan and stir over low heat for about 10 minutes or until thickened.
• 4.
  Pour the mixture into a shallow container and freeze until frozen at the edges.
• 5.
  Remove from freezer and beat with an electric beater. Pour back into container and re-freeze. Repeat 2 or 3 times. (Alternatively use an ice-cream machine following manufacturer's directions.)