1

Reserve 6 strawberries for decoration. Put the remaining strawberries into a blender with the grapefruit juice and sugar. Blend until smooth. (You may have to do this in batches).

2

Tip the mixture into an ice-cream maker and follow the manufacturers instructions to freeze the mixture. Alternatively, tip into a freezer container and freeze for about 1-2 hours. Stir with a fork to break up the ice crystals, then freeze again for another hour or two. Repeat the stirring, then freeze until solid.

3

Remove the container from the freezer about 25 minutes before you wish to serve, so that you can break up the granita with a fork. Scoop into chilled glasses or bowls and serve immediately, decorated with the reserved strawberries and sprigs of mint.