egg drop soup

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A Chinese soup, typically made with chicken broth, green onions, and seasonings, into which beaten egg is drizzled immediately before serving and cooked into soft strands that float in the broth.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A Chinese soup of wispy beaten eggs in boiled chicken broth.