2 oz gin
2 tbsp lemon juice
2 tsp triple sec
1 1/2 tsp simple syrup
2 dashes orange bitters
1 splash orange juice
3 - 5 oz soda water

Add the gin, lemon juice, triple sec, simple syrup and orange bitters to a cocktail shaker half-filled with ice cubes. Shake well, and strain into a sour glass. Fill with soda, and top with orange juice. Garnish with a slice of orange, and serve.