Orange freeze

Instructions

• Using a sharp knife, carefully cut a lid off each orange. Scoop out the
  flesh, discarding any pips and thick pith. Put the shells and lids in the
  freezer, and chop the orange flesh, reserving the juice.
• Whisk together the orange juice, flesh and vanilla ice cream until well
  blended. Pour into a freezer container, Cover and freeze for 24 hours,
  stirring occasionally.
• Put 2 large scoops of the ice-cream mixture into each of the frozen
  orange shells, so that it is overflowing at the top. Put the lids on top, and
  return to the freezer for 3 hours before serving.