Mix shortening. margarine, peanut butter, sugars and eggs thoroughly. Mix rest of ingredients and stir in. Chill dough (about 1/2 hour). Heat oven to 350 degrees. Roll dough into balls the size of large walnuts. Place 3 inches apart on cookie sheet. Dip one half of cookie ball in granulated sugar. Place sugar side up. Flatten crisscross fashion with the fork dipped in sugar. Bake for 8-10 minutes, until set but not hard.