For the first layer, heat dark rum and orange juice in medium saucepan until hot but not boiling then remove from heat. Add orange jello and stir until completely dissolved and pour into a 8" x 8" baking dish. Refrigerate for 1 hour or until completely set.
To make the second layer, pour passion fruit rum into medium saucepan. sprinkle unflavored gelatin over surface and allow to soften 5 minutes. Add remaining ingredients and stir to dissolve gelatin completely. Heat mixture over medium heat until hot to the touch but NOT simmering. Remove from heat and allow to cool slightly. Pour passion fruit mixture over orange layer, chill 2 hours or until firmly set.
When ready to serve, cut into desired shapes and garnish with maraschino cherries. Serve cold.
Notes
Short on time? No problem! You can make this recipe up to a day or two in advance—just keep refrigerated until ready to serve.