Egg foo young in the United States, at least as early as the 1930s, created a pancake filled with eggs, vegetables, and meat or seafood. In a U.S. regional variation, many American-Chinese restaurants in St. Louis, Missouri, serve what is called a St. Paul sandwich, which is an egg foo young patty served with mayonnaise, dill pickle, and sometimes lettuce and tomato between two slices of white bread. In the Netherlands, which has a local variation on the Chinese Indonesian cuisine, it is known as "Foe yong hai", and is usually served with a sweet tomato sauce. Strictly, according to "hai" in the
Foo Camp was created by a past attendee of Foo Camp and a few individuals who were interested in organizing their own version of Foo Camp, and hosted at the Socialtext offices in Palo Alto, California, by Socialtext founder Ross Mayfield, with an open invitation to anyone who wanted to join. Since February 2007, former O'Reilly employee Nathan Torkington has hosted an annual Kiwi Foo Camp in Warkworth, New Zealand O'Reilly has since held a series of topical Foo Camps at Google Headquarters, including Science Foo Camp, Collective Intelligence Foo Camp, Social Graph Foo Camp, and others. In December 2010, O'Reilly co-organized