1. Pour the lemon juice and syrup into a cocktail shaker.
2. Shake the bitters into the mixture.
3. Add the grenadine, rum and slices of fresh fruit; stir thoroughly
4. Refrigerate the mixture for 3 hours.
5. Fill a lowball glass with crushed ice.
6. Pour in the unstrained punch.
7. Sprinkle the top with nutmeg and serve chill.