Blackberry Granita
Ingredients
Method
Purée blackberries, sugar, crème de cassis, if using, lemon juice, salt, and 1 cup water in a blender until smooth. Strain purée through a fine-mesh sieve into a 13x9x2 inches baking pan, pressing on solids.
Freeze mixture until edges begin to set, about 30 minutes. Using a fork, scrape to break up frozen portions. Freeze, scraping and breaking up mixture every 20–30 minutes, until mixture resembles fluffy shaved ice, 2–4 hours.
DO AHEAD: Granita can be made 3 days ahead. Cover with plastic wrap and keep frozen. Scrape before serving.
Just before serving, whisk mascarpone, cream, sugar, lemon juice, vanilla, and 1/2 teaspoons lemon zest in a medium bowl until soft peaks form.
Serve granita topped with lemon cream, halved blackberries, and more lemon zest.