1 oz of Vodka
1 tsp of powdered sugar (or sugar)
1/4 oz of rum
2 1/2 oz of Lemon Juice
1/4 oz of creme de cassis (or blackcurrant-flavored liqueur)
Pour the vodka, lemon juice, powdered sugar, rum and creme de cassis into a cocktail shaker half-filled with ice cubes. Shake well, strain into an old-fashioned glass almost filled with ice cubes, and serve.