In a cocktail shaker with ice, add the Averna, bourbon, and bitters. Rinse a cocktail glass with the port (can use tawny or ruby) and pour the remainder into the shaker. Stir all ingredients to combine and strain into the glass. Holding it peel-side down, squeeze the orange twist as you draw it slowly over a match or lighter. Drop the peel into the glass. Recipe courtesy of Duggan McDonnell.