Wyoming Carla - A "Hot Brown" is a hot sandwich created at the Brown Hotel in Louisville, Kentucky, home of the Derby.
The "Hot Brown" is an open-faced sandwich with turkey and bacon, covered in mornay sauce and baked until the sauce begins to brown. Some put ham and tomatos on also.
Can't make it this year but have been to the derby a few times. It's a place that is very hard to explain and everyone should go at least once.