The essence of this liqueur is the Curaçao or Lahara fruit, famous for being inedibly bitter. Luckily, it is also incredibly useful in creating a distinctive liqueur. Having covered the 'Curaçao', what about the 'blue'? Honestly, blue made this liqueur famous, but doesn't do anything for the taste. For all we care, this might as well have been Clear Curaçao - no one would taste the difference.