Jambon beurre is, quite simply, a ham and butter sandwich in a baguette. It is simple, delicious and a classic of french food. The architecture is simple: start with a quality baguette, sliced lengthwise down the middle, spread the cut interiors with a bit of butter and layer in thin slices of ham. That's it. It really is that simple and delicious. Cook's note: no exact amounts have been given for this recipe because the ham to bread ratio is entirely up to personal taste. Slather a healthy amount of butter on the bread to "Seal" The sandwich together and give it a rich flavor, but not so much as to make it greasy.