Mitraillette is a type of food that looks like a sandwich but is really just one big piece of bread that has been cut in half like a hot dog bun. Inside the big bread, there is usually meat, cheese, lettuce, and sometimes French fries or sauce. It's like a combination of a sandwich and a burger! The name "mitraillette" comes from the French word for machine gun, because it's served in a long, narrow shape that looks a bit like a gun. But don't worry - it's just a fun name for this yummy snack!