Strain the orange juice if you wish – I prefer not to. Add lemon juice if you prefer a slightly acid tang.
Boil water and sugar together for 5 minutes. Remove from the heat and when cool stir in juice and orange blossom water.
Freeze in the same way as the lemon granita above.
A decorative way of serving the ice is to pack it into the scooped-out shells or small oranges.