Originating in Fall River, Massachusetts
, in the 1930s or 1940s, the chow mein sandwich
which typically consists of a brown gravy-based chow mein
mixture placed between a hamburger
-style bun and is served hot, is popular on Chinese-American restaurant menus throughout southeastern Massachusetts
and parts of neighboring Rhode Island
Typically, customers ask for their sandwiches to be "strained" or "unstrained." This refers to whether they would like their sandwich with vegetables. If the chow mein is strained it has no vegetables.