Watermelon Ice

Directions

1. 1
   Remove the rind from the watermelon, cut the flesh into 2-inch chunks, and remove the seeds.
2. 2
   Arrange in a single layer on a parchment-lined baking sheet or in a resealable plastic bag; place in freezer until frozen, about 1 1/2 hours.
3. 3
   (Transfer to airtight freezer bags if not using immediately.)
4. 4
   Place the frozen chunks in a food processor; process until smooth.
5. 5
   Add the sugar, lime juice, and Campari; process until fully incorporated, about 5 minutes, scraping down as necessary.
6. 6
   Freeze in an airtight container, at least 2 hours, until firm.
7. 7
   Stir if the juice starts to separate from ice.