Lemon & Lime Crush

Directions

1. 1
   Zest 2 of the lemons and 2 of the limes.
2. 2
   Juice all the fruits and keep the empty shells to serve the granita.
3. 3
   Tip the juice, zest, lemongrass, lime leaf (if using), and sugar into a bowl.
4. 4
   Pour over 2 cups boiling water.
5. 5
   Stir everything together until the sugar has dissolved, then leave to cool and infuse.
6. 6
   Strain the lemon syrup into a tray and freeze, mixing every couple of hours to break up the ice crystals.
7. 7
   Place the lemon and lime halves in the freezer and fill with the granita to serve.