1. Add pineapple slices, water and sugar to a saucepan. Bring it to a boil, and then simmer for 15-20 minutes till the pineapple slices are soft.
2. Add basil leaves and mix.
3. Switch off the flame and use an immersion blender to blend till smooth.
4. Pour into a freezer friendly container and freeze for up to 8 hours.
5. Remove the container from the freezer, and use a fork to scrape off the ice. Keep scraping till all the granita is scraped off and resembles tiny bits of frozen ice.
6. Scoop and serve immediately.

Enjoy your meal!