1 1⁄2 oz Bourbon, Woodford Reserve
              3⁄4 oz Averna
              3⁄4 oz Aperol
              1 ds Peychaud's Bitters
              1 ds Fennel bitters
          Instructions
    
          Shaken or stirred. Serve in double old fashioned glass over single cube/sphere. Orange peel optional.
Is there a particular brand or recipe for the fennel bitters?