In a whisky glass add a few splashes of bitters. Add one ice cube and a splash of the sugar. Stir, using the muddler end of the bar spoon. Add two more ice cubes. Stir. Add some more ice. Stir. Add half the Bourbon measure and some more ice. Stir.

Add some more ice and the rest of the Bourbon. Stir again. Over the top of the glass, squeeze the oil out of the orange rind. Place the orange rind in the glass.