Muddle the orange slice with the rosemary syrup and a splash of Campari in the bottom of a rocks glass. Add bourbon and rocks, stir and garnish with a sprig of rosemary.
In a saucepan over low heat, add 6-9 full sprigs of fresh rosemary to a liter of water. Heat and steep until fragrant and the sprigs begin to lose a bit of color. Add equal parts by weight cane sugar to the rosemary-infused water; stir until dissolved. Let cool. Can be refrigerated for up to two weeks.
Campari Range Orange Wheel
Slice medium orange slices into "sunset wheels." Cover completely with Campari and keep refrigerated in an airtight plastic container for at least 24 hrs.