Sift together the flour, baking powder, salt, and mace. Stir in oatmeal. Melt the butter in a small pan over low heat. Add carob powder and honey and blend well, removing from heat. In a mixing bowl, beat the eggs and gradually add the carob mixture. Add the coffee, pistachios, and almond extract and mix well.
Pour into an oiled 8? square pan and bake for about 35 minutes, or until done.