2 oz of Vodka
1/2 oz of creme de cassis (or blackcurrant-flavored liqueur)
1 tsp of Lemon Juice
1 dash of bitters
5 oz of Ginger ale
Pour vodka, creme de cassis, lemon juice and bitters into a cocktail shaker half-filled with ice cubes. Shake well, and strain into a highball glass almost-filled with ice cubes. Top with ginger ale, and stir well. Garnish with a twist of lemon, and serve.