California Screwdriver

2 oz vodka
1 1/2 oz Grand Marnier orange liqueur
2 1/2 - 3 oz club soda
2 1/2 - 3 oz orange juice

Put Vodka and Grand Marnier in a shaker with ice. Shake and strain into collins glass. Add ice and fill with equal parts of OJ and Soda. Stir and granish with orange slice.