This dessert is bright, sweet, tart, and refreshing. It requires little work - no cooking - just mix, freeze, and scrape the ice crystals that form occasionally until you are left with a beautiful granita. The flavor of this is quite punchy so if it seems a bit too sour for you, dilute with an additional 1/2 cup water and 2 tablespoons of allulose. Feel free to add about a tablespoon of your favorite liquor here for a variation - elderflower would be excellent, for example. The alcohol will also help keep the granita from freezing completely solid but it it not necessary. You can also add a bit of fresh herbs such as mint or basil. If you prefer a garnish, a few raspberries or some candied lemon zest would be excellent here.