Cut some stale baker's bread into slices half an inch thick; if you have a half-moon shaped cutter, cut them into crescents with it, if not divide into diamonds or any shape you please; fry these a very pale brown in hot butter; spread on each a little thin mustard, and over that a layer of rich cheese; season with a little salt and white pepper; bake in a sharp oven till the cheese is dissolved. Serve hot as possible on a napkin.