1 oz of Vodka
1/2 oz of Blue Curacao (or orange liqueur)
1/2 oz of Lemon Juice
2 to 3 dash of orange bitters
club soda
orange
Add vodka, blue curacao, lemon juice, and bitters to a cocktail shaker with ice. Shake vigorously and strain into a rocks glass filled with ice. Top with club soda and garnish with an orange slice.