Add pineapple juice, lime juice, stevia, rum and ice into a shaker then shake until all incorporated. Divide evenly into glasses or mugs and top with ginger beer.
1/2 cup pineapple juice, Juice of 1 lime, 1/2 teaspoon stevia, 2 ounces coconut-flavored rum, Splash of ginger beer
Garnish with fresh fruit or mint leaves (optional).