Directions

1. Combine the peaches, sugar, nectar, and lemon juice in a blender and puree. Strain into a bowl through a wire mesh sieve and discard any solids.
2. Stir the Prosecco into the peach mixture and pour into a 13-inch x 9-inch baking dish. Cover loosely with plastic wrap and freeze until mixture is beginning to freeze at the edges, about 2 hours. Stir, with a fork, re-cover, and freeze until solid, about 3 hours, scraping with a fork every hour. To serve, scrape into soft clumps with a fork. Spoon granita into chilled glasses or bowls.