The name of this traditional Scottish rooster and leek soup came into use in the 18th century, but the dish itself is said to date as far back as the 16th century. Back then, cock-a-leekie was cooked with the addition of onions, prunes, and even raisins.
The dish was most likely served as a two-course meal; first the broth, then meat. Also dubbed as cockie leekie, this Scottish classic was made famous for being one of the two choices of soup on the menu from the last first-class luncheon served on April 14, 1912 aboard the ill-fated RMS Titanic.