Bolshoi Punch

1 oz vodka
2 1/2 oz lemon juice
1 tsp powdered sugar
1/4 oz rum
1/4 oz creme de cassis

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.