Mix oatmeal, which is ground fine, with a little salt and enough water to make a stiff dough. Roll it on a floured board to one eighth inch thickness, and bake it in one sheet in a slow oven without browning, until dry and hard. It should be gray in color. When done, break it into irregular pieces. This is a Scotch dish, and in Scotland is made with a fine oat flour, which is difficult to obtain in this country.