1. Step
To prepare simple syrup: Bring sugar and water to a simmer in a small saucepan over medium heat, stirring occasionally until the sugar dissolves. Stir in lemon zest and remove from heat. Cover and let steep for 1 hour, then strain the syrup through a fine-mesh sieve; discard the zest. (You'll have extra syrup; refrigerate for up to 1 week.)