1.Cut the lemongrass into thirds; bruise with the handle of a heavy knife. Place lemongrass in a medium saucepan with the sugar and water. Stir over heat, without boiling, until sugar is dissolved. Bring to the boil; reduce heat, simmer, uncovered, for 5 minutes. Pour syrup into a large heatproof jug or bowl; cool.
2.Stir the juices and vodka into the syrup. Strain mixture into a wide shallow metal cake pan; freeze for 1 hour. Using a fork, scrape the ice from the edges back into the liquid. Return to the freezer and repeat three times, or until the granita looks like crushed ice.
3.Cut pineapple into wedges. Serve the granita in chilled glasses with pineapple.
Suitable to freeze and microwave.
Note
Related
Sign up for our newsletter
Want 20% off at THE ICONIC? Sign up to the latest news at Women’s Weekly Food.