STIR bourbon and maple syrup in base of mixing glass until syrup dissolves. Add bitters and ice and STIR again. Strain into ice-filled glass.
*To make the fat washed bourbon: Grill 4 slices of bacon to obtain 30ml/1oz of warm fat (originally Benton's bacon was used but any extra-smoky bacon will suffice) and pour this into a 70cl of bourbon (in a 75cl bottle). Leave to infuse at room temperature for a day before placing bottle in a freezer to solidify the fat. Then clarify the bourbon by straining into a clean bottle.
Even vegetarians like bacon and everybody likes Old Fashioneds.
Created in 2008 by Don Lee at Manhattan’s exclusive and elusive PDT bar. PDT is short for ‘Please Don't Tell’ and perhaps the most famous of New York’s numerous bars modelled on Prohibition speakeasies.