Waldorf salad
Concise Oxford English Dictionary © 2008 Oxford University Press:
Waldorf salad /ˈwɔːldɔːf/
▶noun a salad made from apples, walnuts, celery, and mayonnaise.
– origin early 20th cent.: named after the Waldorf -Astoria Hotel in New York, where it was first served.
'Waldorf salad' also found in these Oxford entries:

