My mom used to make these when I was growing up. I grew up in central Illinois close to an Amish community and mom somehow got this recipe. The original recipe called for beating with a "rotary" beater but of course we now use our mixers and to grind the raisins and peanuts in a food grinder!!
Using your food processor, pulse raisins and peanuts until finely ground and set aside. Sift flour, baking powder, salt, nutmeg and cinnamon into a very large bowl. Cut in shortening using a pastry blender until mixture forms fine crumbs. (I have also put this in my food processer and done this.) Add ground raisin mixture, sugar and oats. Mix well.
Dissolve baking soda in buttermilk in a small bowl. Add molasses and 3 of the eggs. Beat with mixer on low until blended. Add to flour mixture, mixing well with spoon.
Drop by heaping tablespoons about 3 inches apart on GREASED baking sheets. Flatten each with a floured bottom of a drinking glass. Beat 1 egg in a bowl until blended. Brush tops of cookies with egg. Bake for 8-10 minutes or until golden brown.