In a saucepan stir together the water, the sugar, the Pernod, and the zest, boil the mixture, stirring, until the sugar is dissolved, and simmer it for 5 minutes. Stir in the lemon juice, transfer the syrup to a bowl, and chill it, covered, until it is cold. In a blender or food processor puree the cantaloupe, scraping down the sides with a rubber spatula, until it is smooth, blend in the cream and the syrup, and force the mixture through a coarse sieve set over a bowl, pressing hard on the solids. Freeze the mixture in an ice-cream freezer according to the manufacturer's instructions.