Instructions
- Cut the watermelon in half and scoop out the flesh into a blender.
- Blend the watermelon until smooth and strain the juice into a large punch bowl to remove any pulp.
- Add the rum and lime juice to the watermelon juice in the punch bowl.
- Stir in the soda water gently to combine.
- Add ice and garnish with slices of watermelon and fresh mint leaves before serving.