Egg Foo Yong is a Chinese-American dish consisting of an omelette-like egg mixture with vegetables, meat, and sometimes seafood. It is often served with a sweet and sour sauce. The name is derived from the Cantonese phrase 'Foo Yung, ' which translates to 'mixed with eggs.' The dish is believed to have originated in the late 19th century in the United States, but its exact origin is unknown.