2 oz. Gin - (more)
1 tbsp. Port - (more)
1 tsp. Water - (more)
1/2 tsp. Powdered Sugar - (more)
Carbonated Water - (more)
Dissolve powdered sugar in water and add gin. Pour into a highball glass over 2 ice cubes. Fill with carbonated water and stir. Float port on top, sprinkle lightly with nutmeg, and serve.