Zwieback

One cake of compressed yeast dissolved in one cupful of scalded milk, a pinch of salt, and enough sifted flour to make a soft dough. Let rise until very light, then stir in one fourth of a cupful of melted butter, one fourth of a cupful of sugar, and one unbeaten egg. Mix thoroughly, and sift in enough more flour to make a smooth, elastic dough. Shape into a loaf and let rise until very light. A Russian-iron bread-pan holding one loaf is best for Zwieback. Let it rise once more until very light, then bake in a quick oven. Glaze with sugar dissolved in milk just before taking from the oven. When the loaf is cold, cut in half-inch slices and place in an open oven until golden-brown, dry, and crisp.