1 large stick lemongrass
4 lime leaves, optional
Zest 2 of the lemons and 2 of the limes. Juice all the fruits and keep the empty shells to serve the granita.
Tip the juice, zest, lemongrass, lime leaf (if using), and sugar into a bowl.
Pour over 500ml boiling water. Stir everything together until the sugar has dissolved, then leave to cool and infuse.
Strain the lemon syrup into a tray and freeze as stated. Place the lemon and lime halves in the freezer and fill with granita to serve.
Recipe adapted from: Good Food