Muddle together the sugar, bitters and orange zest in the bottom of an old fashioned glass. Pour over the whiskey and add the cherry, if using. Top with some Orange Swirl Ice Cubes.
To make Orange Swirl Ice Cubes, use a zester to make long strips of orange zest and curl them into swirls. Add one piece of zest to each compartment of an ice cube tray, fill with distilled water and freeze overnight.
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