The Romans and ancient Greeks ate mixed greens with dressing.[4][5] In his 1699 book, Acetaria: A Discourse on Sallets, John Evelyn attempted with little success to encourage his fellow Britons to eat fresh salad greens.[6] Mary, Queen of Scots, ate boiled celery root over greens covered with creamy mustard dressing, truffles, chervil, and slices of hard-boiled eggs.
The United States popularized mixed greens salads in the late 19th century[citation needed]. Salads including layered and dressed salads were popular in Europe since Greek imperial and particularly Roman imperial expansions. Several other regions of the world adopted salads throughout the second half of the 20th century.[citation needed] From Europe and the Americas to China, Japan, and Australia, salads are sold in supermarkets, at restaurants and at fast food chains. In the US market, restaurants will often have a "Salad Bar" laid out with salad-making ingredients, which the customers will use to put together their salad.[citation needed] Salad restaurants were earning more than $300 million in 2014.[7]