The st. paul sandwich can be found in many chinese american restaurants in st. louis, missouri, as well as other cities in missouri, including columbia, jefferson city, and springfield. the sandwich consists of an egg foo young patty (made with mung bean sprouts and minced white onions) served with dill pickle slices, white onion, mayonnaise, and lettuce between two slices of white bread. the st. paul sandwich also comes in different combinations and specials, such as chicken, pork, shrimp, beef, and other varieties.

Source: Wikipedia