Preheat oven to 400 degrees. Add all of the dry ingredients in a large bowl and mix very well, being very careful to break up any lumps of brown sugar. Pour all of the buttermilk into the bowl at once and stir, using a wooden spoon, just until a soft dough is formed. Do not try to make it smooth at this point. Pour the contents of the bowl out onto a plastic counter and knead for a minute or so until everything comes together. Divide thedough into 2 portions and shape each into a round loaf, pressing the top down a bit to just barely flatten it. Place the loaves on a large ungreased baking sheet. Sprinkle some additional flour on top of each loaf and, using a sharp paring knife, make the sign of the Cross in slashes on the top of each. Bake for about 45 minutes or until brown and crunchy. Cool on racks. Recipe by: Frugal Gourmet On Our Immigrant Ancestors Posted to sdm-marked Recipes Digest by Curtis & Theresa Dunlap on Mar 06, 1998