1 1/2 oz of Light Rum
1 of egg
1/2 oz of sweet vermouth
1/2 oz of tawny port (or port)
1 oz of Lemon Juice
1 tsp of superfine sugar (or sugar)
Pour all ingredients into a cocktail shaker half-filled with ice cubes. Shake well, strain into an old-fashioned glass almost filled with ice cubes, and serve.