Sterilize everything: all bowls, bottles, and utensils.
Clean all icky bits from eggs one at a time. Put in big bowl.
Beat with large piece of lemon peel (this gets rid of the raw taste so the eggs). Remove lemon peel and discard.
Add condensed milk to eggs and stir.Add rum. Stir.Add grated nutmeg. Add a dash of bitters.
Strain into sterilized bottles with screw top lids. Store in the refrigerator and serve cold with a dollop of whipped cream for garnish.