Start by placing a cocktail shaker on your countertop. Pour in orange juice and pineapple juice, filling halfway. Add in zero-proof rum and stir gently.

Add a handful of ice cubes to the shaker. Secure the lid tightly and shake vigorously for about 15-20 seconds.

Take a tall glass and fill it halfway with crushed ice. Hold the glass at an angle, pour the chilled juice mixture over the ice.

Add a couple of dashes of grenadine and drizzle it slowly into the glass. Top off with a splash of Sprite.

Garnish with colorful slices of tropical fruit like pineapple, cherries, or oranges for a finishing touch.