Allow butter to reach room temperature. Cream sugar and butter together until light and fluffy. Add eggs one at a time and mix well. Add in flour, powdered milk, and corn syrup. Beat each in well. Add juice of half a lemon, salt, vanilla, nutmeg and mace. Make sure everything is well blended, and pour into a greased loaf pan.
Bake at 325 degrees F (165 degrees C) for 45 minutes, checking for doneness by inserting a toothpick and seeing if it comes out clean. You almost want to underbake this.