A hot brown sandwich (sometimes known as a louisville hot brown or kentucky hot brown) is an american hot sandwich originally created at the brown hotel in louisville, kentucky, by fred k. schmidt in 1926. it is a variation of traditional welsh rarebit and was one of two signature sandwiches created by chefs at the brown hotel shortly after its founding in 1923. it was created to serve as an alternative to ham and egg late-night dinners.
Source: Wikipedia