A Greek soup as well as a sauce, both of which are made from chicken broth, egg yolks and lemon juice. The main difference is that the soup has rice added to it. The sauce is thicker than the soup.
From The Food Lover's Companion, Fourth edition by Sharon Tyler Herbst and Ron Herbst. Copyright © 2007, 2001, 1995, 1990 by Barron's Educational Series, Inc.