You can serve this cocktail straight or on the rocks. Chill the glasses first if you will be serving the cocktail straight.
Use a vegetables peeler to peel the outer skin of the orange, without the white rind, and twist it tight to squeeze the natural oils from the orange. Rub the orange twist over the rim of the glass.`
Combine fresh squeezed lemon juice, simple syrup, splash of fresh orange juice, and bourbon in a cocktail shaker. Add a few ice cubes and shake vigorously.**Optional: add 2 drops of orange bitters to the cocktail shaker.
Add a few ice cubes to the glass if desired, pour the cocktail into the glass through a strainer, and enjoy.