In small saucepan, bring pineapple juice, 7 ounces water, lime juice, and demerara sugar to a boil over medium heat. Stir until sugar dissolves. Cover and refrigerate for 1 hour.
In the container of an ice cream maker, add pineapple juice mixture, rum, and Campari. Churn until mixture reaches a slushy consistency, 5 to 10 minutes. Serve immediately. Garnish with pineapple leaves and pineapple wedges, if desired.
Recipe by Louisiana Cookin' at https://louisianacookin.com/frozen-jungle-bird/