Place all ingredients for the granita of your choice in a high speed blender and blend until very smooth.
Pour into a glass container or metal loaf pan. Freeze 25 minutes.
Use a fork to stir the icy edges of the liquid into the center. Freeze again, stirring 2 more times until frozen, about 90 minutes.
Use a fork to scrape the granita into flaky ice crystals. Cover and freeze.
When ready to serve, scrape granita into serving bowls.