Step 1
Prepare the simple syrup. In a small saucepan, combine sugar, water, and orange rind. Bring the mixture to a boil, stirring, until sugar has dissolved. Remove from heat, discard the orange rind and allow the syrup to cool.
Step 2
Add vodka, orange juice, orange liqueur, lemon juice, simple syrup, and ice to a cocktail shaker. Shake well. Strain into two martini glasses. Garnish with a piece or orange rind. Serve immediately.