carbonated water (or sparkling water)
2 oz of Brandy
1/2 tsp of powdered sugar (or sugar)
1 tsp of water
1 tbsp of port
nutmeg
Dissolve powdered sugar in 1 tsp. water. Add brandy and pour into a highball glass over ice cubes. Fill with carbonated water and stir. Float port on top, sprinkle lightly with nutmeg, and serve.