Add bourbon, coffee liqueur, rich sugar syrup, and orange bitters to a mixing glass.
Fill with ice and stir for approximately 30 seconds until well chilled and diluted.
Fine strain into a chilled Nick & Nora glass.
Hold an orange zest twist skin-side down over the glass and briefly flame it to express the oils.
Rub the twist around the rim, then place it on the glass as garnish.
The Revolver was created by Jon Santer in San Francisco in the early 2000s and is widely credited as one of the cocktails that helped legitimise coffee liqueur as a serious cocktail ingredient. The flamed orange zest is essential - not just decorative - as its expressed oils dramatically lift the aroma on the nose.
My Bar Shelf reads your shelf and shows you every cocktail you can make from what you already own, including Revolver.