Beat three-quarters of a pound of butter and a pound of sugar to a cream; add three eggs, one saltspoon of salt, a gill of caraway seeds and a teaspoon of powdered mace, stirring all well together to a cream; then pour in a cup of sour milk in which a level teaspoon of baking-soda is stirred.
Hold the cup over the mixing bowl while stirring in the soda, as it will foam over the cup. Last of all stir in enough sifted flour to make a light dough, stiff enough to roll thin. Roll on a pastry board well dusted with flour. Cut in round shapes and place in baking-tins well rubbed with flour.
Sprinkle a little sugar over the cookies and bake them in a moderate oven till a light brown. When cool, carefully lift the cookies from the pans with a pancake turner.