A bacon sandwich is a sandwich of cooked bacon between bread that is optionally spread with butter, and may be seasoned with ketchup or brown sauce. It is generally served hot. In some establishments the sandwich will be made from bread toasted on only one side, while other establishments serve it on the same roll as is used for hamburgers.
Bacon sandwiches are an all-day favourite throughout the United Kingdom and the Republic of Ireland. They are often served in British cafes and delis, and are anecdotally recommended as a hangover cure.