Cajun Blackened Whitefish iASC Cajun Blackened Whitefish: an idea for your menus. iASC Irish Shellfish Butter is used in the preparation of a cajun-spiced portion of whitefish like Bass or Basa. This recipe will work with any type of whitefish. Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related