Ingredients

Makes 5 cups

　　1 4-pound wedge watermelon

　　1/2 cup superfine sugar

　　1/4 cup fresh lime juice

　　2 tablespoons Campari

　　

Step 1

Remove the rind from the watermelon, cut the flesh into 2-inch chunks, and remove the seeds. 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. (Transfer to airtight freezer bags if not using immediately.)

　　

Step 2

Place the frozen chunks in a food processor; process until smooth. Add the sugar, lime juice, and Campari; process until fully incorporated, about 5 minutes, scraping down as necessary. Freeze in an airtight container, at least 2 hours, until firm. Stir if the juice starts to separate from ice.

　　Reprinted with permission from The Martha Stewart Living Cookbook: The New Classics by Martha Stewart Living Magazine, copyright © 2007. Published by Clarkson Potter, a division of The Crown Publishing Group.Buy the full book from Amazon.