Preheat oven to 450*F

Over a large mixing bowl, sieve all the dry ingredients together (I have a beloved flour sifter that I put everything through, but a fine mesh colander works fine)

A little at a time, add the buttermilk, mixing well after each addition. Once all the buttermilk is added, continue stirring until the dough is shaggy and barely combined. Turn onto a lightly floured countertop and gently knead until the bread is shaped into a round. Slice a cross shape into the top of the loaf.

Bake at 450*F so 10 minutes, then turn the heat down to 400*F and continue baking for 30-45 minutes. Bread is done when you can turn it over and hear a hollow sound when you knock on the bottom of the loaf. Wrap in a kitchen towel and let sit at least half an hour before cutting.